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824 


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no. 66: 


59 


pt.2 






THE RESOURCES AGENCY OF CALIFORNIA 
p a r t m e n t of Wa ter Resources 



BULLETIN No. 66-59 



QUALITY OF GROUND WATERS 

IN CALIFORNIA 
1959 






PART II 
SOUTHERN CALIFORNIA 



EDMUND G. BROWN 

Governor 

State of California 



FEBRUARY 1963 



I TT2RARY 

f»!fl»*'-.<»4TY OF CALLFORNIA 
DAVfS 



WILLIAM E. WARNE 

Administrafor 

The Resources Agency of California 

oncf Director 

Department of Water Resources 



state ot California 
THE RESOURCES AGENCY OF CALIFORNIA 

Department of V(/d ter Resources 



BULLETIN No. 66-59 



QUALITY OF GROUND WATERS 

IN CALIFORNIA 
1959 



PART II 
SOUTHERN CALIFORNIA 



FEBRUARY 1963 



EDMUND G. BROWN WILLIAM E. WARNE 

Governor Adminisfrator 

State of California """^^ Resources Agency of California 

ond Director 
Department of Water Resources 



TABLE OF CONTENTS 



Page 



LETTER OF TRANSMITTAL ix 

ORGANIZATION, lEPARTWiNT OF WATER RESOURCES x 

ACKNOWLEDGMENT xi 

THE GROUND WATER QUALITY MONITORING PROGRAM ... 1 

QUALITY OF GROUND WATERS IN SOUTHERN CALIFORNIA, 1959. . 7 

Central Coastal Region (No. 3) 9 

Santa Maria River Valley (3-1?) 11 

Ground Water Occurrence 11 

Ground Water Development and Use 11 

Major Waste Discharges 11 

Monitoring Program 12 

Evaluation of Water Quality 12 

Significant Water Quality Changes 13 

Cuyama Valley (3-13) 17 

Ground Water Occurrence 17 

Ground Water Development and Use 17 

Major Waste Discharges 17 

Monitoring Program 18 

Evaluation of Water Quality 18 

Significant Water Quality Changes 18 

Los Angeles Region (No. ^) 23 

Oxnard Plain Basin (4-4.01) 25 

Ground Water Occurrence 25 

Ground Water Development and Use 25 

Major Waste Discharges 25 

Monitoring Program 25 

Evaluation of Water Quality 26 

Significant Water Quality Changes 27 



ill 



Page 

West Coast Basin (4-11.02) 33 

Ground Water Occurrence 33 

Ground Water Development and Use 3^ 

Major Waste Discharges 3*+ 

Monitoring Program .... 3^ 

Santa Monica Bay Area Jk 

Evaluation of Water Quality 35 

Signifcant Water Quality Changes • . 35 

Hawthome-Gardena Area J6 

Evaluation of Water Quality 37 

Significant Water Quality Changes 37 

Torrance Area , 37 

Evaluation of Water Quality 38 

Significant Water Quality Changes 38 

Central Basin Pressure Area and 

Los Angeles Forebay Area (i|-11o03 and ^1-11.04) kj 

Ground Water Occurrence ^3 

Ground Water Development and Use ^+3 

Major Waste Discharges ^+3 

Monitoring Program ... ^ 

Evaluation of Water Quality ^ 

Significant Water Quality Changes , ^5 

Main San Gabriel Basin (4-13.01) ^9 

Ground Water Occurrence . 49 

Major Waste Discharges 49 

Monitoring Program 49 

Evaluation of Water Quality 50 

Significant Water Quality Changes 50 

Lahontan Region (No. 6) 55 

Lower Mojave River Valley, Barstow to Yenno 57 

Ground Water Occurrence 57 

Ground Water Development and Use 57 

Major Waste Discharges • 57 

Monitoring Program 58 

Evaluation of Water Quality 58 

Significant Water Quality Changes 59 



iv 



Page 

Colorado River Basin Region (No. 7) 65 

Coachella Valley (7-2l) 6? 

Ground Water Occurrence 67 

Ground Water Development and Use 67 

Major Waste Discharges 68 

Monitoring Program 68 

Evaluation of Water Quality 68 

Significant Water Quality Changes 69 

Santa Ana Region (No. 8) 75 

Anaheim Basin Pressure Area (8-1.01) 77 

Ground Water Occurrence 77 

Ground Water Development and Use 78 

Major Waste Discharges 78 

Monitoring Program 78 

Evaluation of Water Quality 78 

Significant Water Quality Changes 79 

Chine Basin (8-2.01) 85 

Ground Water Occurrence 85 

Ground Water Development and Use 85 

Major Waste Discharges 86 

Monitoring Program 86 

Evaluation of Water Quality 86 

Significant Water Quality Changes 87 

Bunker Hill Basin (8-2.06) 91 

Ground Water Occurrence 91 

Ground Water Development and Use 91 

Major Waste Discharges 91 

Monitoring Program 91 

Evaluation of Water Quality 92 

Significant Water Quality Changes 92 

San Diego Region (No. 9) 97 

San Luis Rey Valley, Mission Basin (9-7. 01 ) 99 

Ground Water Occurrence 99 

Ground Water Development and Use 99 

Major Waste Discharges 99 

Monitoring Program 100 

Evaluation of Water Quality 100 

Significant Water Quality Changes 100 



Page 

El Cajon Valley (9-16) 105 

Ground. V/ater Occurrence IO5 

Ground Water Development and Use IO5 

Major Waste Discharges IO5 

Monitoring Program IO5 

Evaluation of Water Quality 105 

Significant Water Quality Changes 106 

Tia Juana Valley Basin (9-I9) I09 

Ground Water Occurrence IO9 

Ground Water Development and Use 109 

Major Waste Discharges IO9 

Monitoring Program I09 

Evaluation of Water Quality 110 

Significant Water Quality Changes 110 

PLATES 

Following 
Plate No, Page No. 

1 Monitored Areas 1959 6 

2 Sajita Maria River Valley I6 

3 Cuyaraa Valley 22 

k Oxnard Plain Basin 32 

5 West Coast Basin k2 

6 Central Basin Pressure Area and Los Angeles Forebay . . kQ 

7 Main San Gabriel Basin 54 

8 Lover Mojave PtLver Valley Basin, Bar stow to Yermo ... 6h- 

9 Coachella Valley South jh 

10 Anaheim Basin Pressure Area 8U 

11 Chino Basin 90 

12 Bunker Hill Basin 96 

13 Mission Basin, San Luis Rey Valley 104 



vi 



PLATES 
Plate No. 

1^ El Cajon Basin 

15 Tia Juana Basin 

APPENDIXES 

A. Procedures and Criteria 

B, Well Data, Analyses of Ground Water and 

Radioassay of Ground Water, 1959 

ALPHABETICAL LISTING OF REGIONS AND MONITORED AREAS 

Regions 

Central Coastal Region (No. 3) 

Colorado River Basin Region (No. 7) 

Lahontan Region (No. 6) 

Los Angeles Region (No. 4) 

San Diego Region (No, 9) 

Santa Ana Region (No. 8) 

Areas 

Anaheim Basin Pressure Area (8-1.01) 

Bunker Hill Basin (8-7. 06) 

Central Basin Pressure Area (if-1103) 

Chino Basin (8-2.01) 

Coachella Valley (7-21) 

Cuyama Valley (3-13) 

El Cajon Valley (9-16) 



Following 
Page No. 

108 

112 



A-1 
B-1 



9 
65 
55 
23 
97 
75 

77 
91 

85 

67 

17 

105 



Vll 



Areas 

Page 

Los Angeles Forebay Area C^-ILOS) k'S 

Lower Mojave River Valley (6-Uo) 57 

Main San Gabriel Basin (i|-13.0l) 1+9 

Oxnard Plain Basin (U-4.01) 25 

San Luis Key Valley, Mission Basin (9-7-01) 99 

Santa Maria River Valley (3-12) 11 

Tia Juana Valley Basin (9-19) 109 

West Coast Basin (14-11.02) 33 



viii 



AM E. WARNE 
)irector of 
ler Resources 

OTT GOLDBERG 
Deputy Director 

JALD C. PRICE 
' Director Policy 

lY GARDNER 
3uty Director 
ministration 

:ED R. GOIZe' 
ief Engineer 



EDMUND G. BROWN 

GOVERNOR OF 
CALIFORNIA 



WILLIAM E. WARNE 

ADMINISTRATOR 
RESOURCES AGENCY 




ADDRESS REPLY TO 
P. O. Box 388 
Socramento 2, Calif. 



THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

1120 N STREET, SACRAMENTO 

December 28, 1962 



Honorable Edmund G. Brown, Governor, 
and Members of the Legislature of the 
State of California 

Water Pollution Control Boards 



Gentlemen: 

I have the honor to transmit Bulletin No, 66-59 entitled 
"Quality of Ground Waters in California, 1959, Part II, Southern 
California." This report covers the period January through December 
1959. The quality of ground waters in Northern and Central California 
is discussed in Part I, published in July 1961, 

This is the fifth in a continuing series of reports on the 
ground water quality monitoring program conducted by the Department of 
Water Resources, Under this program, water samples from representative 
wells in ground water basins throughout the State are collected and 
analyzed, and an annual evaluation of ground water quality conditions is 
made. Mineral and radiological analyses were made of ground waters 
taken from approximately 200 wells in l6 monitored areas in Southern 
California, 

Less than normal precipitation in the 1958-1959 rainfall season, 
and the consequent greater utilization of ground water intensified 
existing problems of impairment of groxind water quality in the areas 
monitored in Southern California during 1959. Sea-water intrusion and 
connate water encroachment or pollution resulting from return of waste 
waters to the underground basins continued to exhibit local effects of 
degradation on ground water quality. 

Very sincerely. 



c/U(iu„ /". IjI^^ 



Director 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 
DEPARTMENT OF WATER RESOURCES 



WILLIAM E. 



EDMUND G. BROWN, Governor 

WARNE, Administrator, The Resources Agency of California 

and Director, Department of Water Resources 

ALFRED R. GOLZE', Chief Engineer 

JOHN R. TEERINK, Assistant Chief Engineer 



SOUTHERN DISTRICT 

James J. Doody District Engineer 

Lloyd C. Fowler Chief, Planning Branch 

This report was prepared under the direction of 

David B. Willets Head, Water Quality Section 

by 

Felix Cartier Water Resources Engineering Associate 

assisted by 

Eugene C. Ramstedt Assistant Civil Engineer 

Joseph R. Rodriguez Engineering Aid II 



ACKNOWLEDGMENT 

The broad coverage of the statewide ground water quality 
monitoring program is made possible through the combined efforts of many- 
public and private agencies. Although the program was initiated by the 
Department of Water Resources, the present scope of the program could not 
have been achieved without the valuable assistance of these other 
agencies. The generous and valuable assistance of the following agencies 
is gratefully acknowledged: 

United States Geological Survey 

California Department of Public Health, Bureau of 

Sanitary Engineering 
California Disaster Office, Radiological Service 
Los Angeles County Flood Control District 
Orange County Air and Water Pollution Control 

Committee 
San Bernardino County Flood Control District 



xi 



- 



THE GROUND WATER QUALITY MONITOR IM} PROGRAM 

Water developnent to meet the needs of California's phenomenal 
growth during the past decade has became one of the major problems 
facing the State. As the water resources of California are more fully 
utilized to meet the requirements imposed by the rapid expansion in 
population, agriculture, and industry, axid as the number of suitable 
surface storage sites dwindles, water developnent planners are turning 
more and more to ground water supplies. Although the use of ground 
water has been, and is, one of the major factors contributing to the 
economy of the State, insufficient data are available regarding the 
mineral quality of such ground water supplies. The present widespread 
dependence upon ground water, together with the need for more intensive 
utilization of underground storage, requires constant vigilance coupled 
with remedial action, where necessary, to assure that the quality of 
ground water remains suitable for all intended uses. 

In view of the extensive occurrence of ground water and its 
relatively slow rate of movement, determination of ground water quality 
and detection of changes therein require reliable long-term observation 
and records. Such data are essential to any program of quality control 
and are indispensable to fonmilation of plans for the coordinated opera- 
tion Of surface and underground storsige. To help meet this need, a 
statewide program of observation and study of groiind water quality was 
initiated by the Department of Water Resources in 1953 under the authority 
of Section 229 of the California Water Code. 

Section 229 of the California Water Code directs that the 
department shall: 



"... investigate conditions of the quality of all waters within 
the State, including saline waters, coastal and inland, as re- 
lated to all soiirces of pollution of whatever nature and shall 
report thereon to the Legislature and to the appropriate regional 
water pollution control board annueLlly, and may recommend any 
steps which might be taken to improve or protect the quEility of 
such waters . " 

Accordingly, the objectives of the ground water quality monitoring pro- 
gram are: 

(1) To provide information on the prevailing mineral quality 
of ground waters; 

(2) To provide a reliable, continuing check on quality of 
ground waters; 

(3) To secure data relating to significant changes in mineral 
quality, to evaluate the causes for these changes and to 
identify and delineate the areas affected by such changes; 

(^4^) To notify the appropriate regulatory agencies regarding 

the findings of the program, and 
(5) To provide the required data on ground water quality for 
the purpose of planning and constructing water resources 
developments. 
Tart I of this bulletin, dated July 19^1, presents data on, 
and an evaluation of, ground water quality conditions in Northern and 
Central California for the period January through December 1959- The 
area covered in Part I comprises all of Water Pollution Control Regions 
1, 2, eind 5; Region 3 north of the San Antonio- Salinas River drainage 
boundary; and Region 6 north of the northern Mono Lake drainage boundary. 
Part II presents data on, and an evaluation of, groiind water quality 
conditions in Region 3^ south of the San Antonio- Salinas River drainage 



-2- 



botindary; Region 6, south of the northern Mono Lake drainage boundary; 
and all of Regions k, 7j 8, and 9- The areas of Southern California 
monitored during the 1959 program are shown on Plate 1, "Monitored Areas 

19$9." 

Data for previous periods are included in the following reports: 

1. California Department of Public Works, Division of Water 
Resources, Water Quality Investigations, Report No. Ik, "Gro\ind 
Water Quality Monitoring Program in California, Progress 
Report 1953-195^- " 

2. California Department of Water Resources, Division of Resources 
Planning, Bulletin No. 66, "Quality of Ground Waters in 
California, 1955-1956 . " 

3. , "Quality of Ground Waters in California, 1957-" 

k. , Bulletin No. 66-58, "Quality of Ground Waters in 

California, I958." 

In establishing the areas included within the ground water 
quality monitoring program, requests and suggestions from regional water 
pollution control boards and other interested water agencies have been 
considered. During 1959> the program in Southern California led to the 
collection and analysis of ground water samples taJcen from about 200 
wells in I6 ground water basins or portions of basins. The geographical 
location and areal extent of each of the monitored areas is indicated 
on Plate 1. 

The selection of the individual wells sampled is governed, to 
a large extent, by the availability of well logs. Sufficient informa- 
tion such as depth, aquifers encovintered, and depths of perforations 
is desirable for each sampled well to assure that data obtained are useful. 



-3- 



Wells are added to, or deleted from, the network according to changing 
groiind vater conditions in an area. For example, a well showing 
prominent effects of sea-water intrusion is generally removed from 
productive use and, in many instances, sampling becomes impracticable. 
Accordingly, another well is substituted, if available. 

Tests made of ground water quality include mineral and radio- 
logical determinations. The frequency of sampling, type of analysis, 
and density of the sampling network for mineral tests depend largely on 
the conditions in the area being monitored. In areas where water quality 
problems are known to exist and where extensive use is made of ground 
water supplies, samples are taken one or more times each year. In 
areas where limited use is made of groiind waters, samples are taken 
periodically until sufficient data are collected to determine the water 
quality of the basin and thereafter as frequently as the land development 
and water use warrants. 

Radioassays of well waters are made annually. In general, 
only the minijnum nianber of wells necessary to show the areal extent of 
problems, if any, or to evaluate ground water conditions, are included 
in the radiological monitoring network. 

In this report the monitored areas are grouped for purposes 
of discussion by water pollution control board regions, the boimdsiries 
of which, in most cases, coincide with those of the major drainage 
basins of the State. Within these regions the monitored areas are iden- 
tified by basin numbers which provide quick data reference and permit 
machine processing of the data. The identifying basin nimibers used in 
this report are based on a decimal system in the form 0-00.00. The 



-U- 



nxanlDer to the left of the dash refers to the regional water pollution 
control board the beisin is located within. On the right of the dash 
the first digit or digits refer to the basin, valley, or area. Digits 
to the right of the decimal, if smy, refer to the subbasin munber as 
shown below. 



0-00.00 



subbasin 

basin, valley, or area 

water pollution control board region 



It should be noted that a "monitored area" is defined as that portion 
of a ground water basin which lies generally within the limits of an 
established network of monitored wells. It does not necessarily include 
the entire ground water basin. 

Wells selected for inclusion in the ground water quality 
monitoring network are assigned numbers by township, range, and section, 
based upon their location. The numbering system is the same as that 
utilized by the United States Geological Survey. Under this system 
each section is divided into 40-acre plots, which are lettered as follows; 



D 


C 


B 


A 


E 


F 


G 


H 


M 


L 


K 


J 


N 


P 


Q 


R 



Wells are numbered within each of these ^-acre plots according to the 
order in which they are located. For example, a well having a number 
3N/6E-2hA2 is located in Township 3 North, Range 6 East, and in Section 
2k. It is further described as the second well identified in the ^- 
acre plot lettered A. 

-5- 



The information presented in the text that follows for each 
monitored area includes: a brief description of the area and the 
monitoring program; the occurrence, developiaent, and beneficial uses 
of ground water; a discussion of major waste discharges; and an evalua- 
tion of any significant cheinges in ground water quality. Following the 
presentation for each area, a graph shows conductivity and problem 
constituent ranges and, where meaningful, graphs of fluctuations of 
problem constituents in selected wells. A map of the monitored area 
shows monitored well locations and known area of ground water degradation. 

Following the discussions of the monitored areas are two 
appendixes that present detailed information on procedures and analyses. 
Appendix A presents discussions of types of mineral analyses employed 
in the monitoring program, of laboratory methods and procedures used, 
and criteria for appraising the suitability of water for drinking, 
irrigation, and industrial uses. Appendix B presents tabulations of all 
mineral and radiological analyses of samples collected in this program 
during 19^9, and available data on ground water monitoring wel^s. 



-6- 



PLATE I 




LEGEND 

— — REGIONAL BOUNDARIES 

MONITORED AREA 

AREA REPORTED IN 
BULLETIN 66-59 PART I 



STATE OF CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS 

IN CALIFORNIA, 1959 

PART n SOUT HER N CALIFORNIA 

MONITORED AREAS 
1959 

SCALE OF MILES 

10 10 20 30 40 50 

1962 



INDEX TO MONITORED AREAS 

CENTRAL COASTAL REGION ( NO. 3 ) 
3-12 SANTA MARIA RIVER VALLEY 
3-13 CUYAMA VALLEY 

LOS ANGELES REGION ( NO. 4 ) 
4-4.01 OXNARD PLAIN BASIN 

4-11.02 WEST COAST BASIN 

SANTA MONICA BAY AREA 
HAWTHORNE-GARDENA AREA 
TORRANCE AREA 

4-11.03 CENTRAL BASIN PRESSURE AREA 
4-11.04 AND LOS ANGELES FORBAY AREA 

4-13.01 MAIN SAN GABRIEL BASIN 

LAHONTAN REGION (N0.6) 

6-40 LOWER MOJAVE RIVER VALLEY, 
BARSTOW TO YERMO 

COLORADO RIVER BASIN REGION (N0.7) 
7-21 COACHELLA VALLEY (SOUTH END) 

SANTA ANA REGION {N0.8) 
8-LOI ANAHEIM BASIN PRESSURE AREA 
8-2.01 CHINO BASIN 
8-2.06 BUNKER HILL BASIN 

SAN DIEGO REGION (NO. 9) 
9-70! SAN LUIS REY VALLEY, MISSION BASIN 
9-16 EL CAJON VALLEY 
9-19 TIA JUANA VALLEY BASIN 



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CALIFORNIA 

RESOURCES 

CT 

QUALITY OF GROUND WATERS 

IN CALIFORNIA, 1959 

PART H SOUT HER N CALIFORNIA 

MONITORED AREAS 
959 

SCALE OF MILES 
10 20 30 40 50 

1962 



QUALITY OF GROUND WATERS 
IN SOUTHERN CALIFORNIA, 1959 



The mineral quality of grotmd water in Southern California 
d\iring 1959 reflected the much below normal rainfall in the I958-I959 
precipitation season. The improvement in ground water quality notice- 
able in seme basins following the more plentiful rainfall in the 1957- 
1958 season was reversed by quality chsmges induced by the dry weather. 

Increased demands on ground water supplies due to lack of 
rain was accompanied by a general lowering of ground water levels. The 
lowered water tables, or pressure surfaces, accentuated previously 
existing degradational effects on water quality exerted by salt water 
intrusion, by inflow of poor quality waters from rocks and sediments 
adjacent to or underlying some vailley fill areas, and by discharges of 
waste waters to areas susceptible to percolation of these wastes to the 
underlying ground water bodies. No new sources of degradation were 
discovered during 1959* 

Although considerable quantities of imported water were used 
to replenish the gro\ind water supplies, there were no monitored areas 
where the influence of such recharge on the groiind water quality was 
evident in 1959. 



-7- 



QUALITY OF GROUND WATERS 
IN SOUTHERN CALIFORNIA, 1959 



The mineral quality of ground water in Southern California 
during 1959 reflected the much below normal rainfall in the 1958-1959 
precipitation season. The improvement in ground water quality notice- 
able in some basins following the more plentiful rainfall in the 1957- 
1958 season was reversed by quality changes induced by the dry weather. 

Increased demands on groimd water supplies due to lack of 
rain was accompanied by a general lowering of groxind water levels. The 
lowered water tables, or pressure surfaces, accentuated previously 
existing degradational effects on water qusLLity exerted by salt water 
intrusion, by inflow of poor quality waters from rocks and sediments 
adjacent to or underlying some valley fill areas, and by discharges of 
waste waters to areas susceptible to percolation of these wastes to the 
iinderlying ground water bodies. No new sources of degradation were 
discovered during 1959- 

Althoiigh considerable quantities of imported water were used 
to replenish the groimd water supplies, there were no monitored areas 
where the influence of such recharge on the groiind water quality was 
evident in 1959- 



-7- 



Central Coastal itegion (llo. 3) 

The Central Coastal Region includes all of the coastal drainage 
areas from the southern boundary of Poscadero Creek Basin in San Mateo 
County to the southeastern boundary of Rincon Creek Basin in Ventura 
County. It extends inland an average of about 50 miles to the crest of 
the coastal mountain ranges, and encompasses an area of approximately 
11,000 square miles. The region is characterized by narrow coastal plains 
and coastal valleys with moderate slopes toward the ocean, backed by 
rugged mountain ranges paralleling the coast. 

Valley areas in this region depend largely on ground water as 
a so\irce of supply, and approximately 90 percent of the water requirements 
are met by ground water pumping, nineteen ground water basins have been 
identified in this region, of which I8 are utilized intensively to supply 
irrigation water. Six ground water basins in this region have been 
included in the statewide ground water monitoring program. These areas, 
the nxmber of monitored wells in each, and the sampling times are listed 
in the following tabulation. 

Monitored sirea Number of wells Sampling time 

Pajaro Valley (3-2)* 
Gilroy-Hollister Basin (3-3)* 
Salinas Valley (3-4)* 
Carmel Valley (3-?)* 

Santa Maria River Valley (3-I2) 27 April and September 
Cuyama Valley (3-I3) 10 April and September 



* These ground water basins are located in Northern and Central CaJLifornia 
and are discussed in Part I of this bulletin. 



-9- 



The quality of ground vater in the monitored areas covered by- 
Part II of this report showed no significant variations in 1959 in compar- 
ison with previously existing conditions. 



-10- 



Santa Maria River Valley (3-12) 

The Santa Maria River Valley is located along the San Luis Obispo 
and Santa Barbara County line. The basin extends 28 miles inland from the 
ocean and includes an area of about 18O square miles. The basin boundaries 
are shovm on Plate 2, "Santa Maria River Valley." 

Gro\md Water Occurrence . The chief sources of ground water are the uncon- 
solidated sediments of Pleistocene and Recent age; namely, the Paso Robles 
formation, the Orcutt formation, and the Recent alluvium. Santa Maria 
River Valley Basin is a free ground water basin except in the western por- 
tion, where sufficient fine grained alluvium accumulated to form a confining 
cap. Waters overlying the confining cap are either perched or semiperched. 
Well yields are low near the perimeter of the valley, increasing toward the 
center. Yields from wells range from less than 100 to 3^000 gpm and average 
about 1,000 gpm. 

Ground Water Development and Use . Ground water is extensively developed in 
Santa Maria River Valley and supplies all water requirements for irrigation, 
domestic, and industrial uses. 

Major Waste Discharges . Brine wastes from oil production and effluents from 
sewage treatment plants constitute the major waste discharges in the Santa 
Maria Valley. Although almost all of the oilfield brine wastes are discharged 
to the ocean by pipeline, the possibility of pollution of ground water by 
oil wastes through spillage, defective casings, or permeable sumps still 
remains. All of the sewage effluents in this area are disposed to ponds 
from which some is used for irrigation. The effluents are discharged in 
an area of high permeability and constitute an involuntary replenishment of 
the free ground water body. 



-11- 



Monitoring Program . The monitoring program was initiated in this area in 
1953 to detect changes in ground water quality which might result from 
sTorface disposal of oil industry wastes. Sampling well coverage origi- 
nally encompassed practically all water wells in the areas of oil pro- 
duction, which are located in the eastern or upper end of the valley. In 
1957> wells in the coastal region were added to monitor an area where sea- 
water intrusion may hecome a problem. Under a cooperative arrangement 
between the department and the United States Geological Survey initiated 
in 1957> the Geological Survey assumed the task of ground water sampling. 
In 1959^ ^3 analyses were obtained from 27 monitored wells. 
Evaluation of Water Queility . Analyses of ground water from Santa Maria 
River Veilley wells in 1959 indicated a nearly uniform character of water 
throughout the basin, predominantly calcium- magnesium sulfate in type. The 
waters were exceedingly hard, and sulfates usually greatly exceeded the 
recommended limit of 250 pjin for drinking water. Analyses of grovind water 
from wells located in the coastal region of the Santa Maria River Valley 
Basin failed to show evidence of sea-water intrusion in 1959* There was, 
however, a rather widespread area of high nitrate ground waters in the 
central j)ortion of the basin. Ranges for significant mineral constituents 
in 1959 were as follows: 

Total dissolved solids 401 to 2,267 ppn 

Chlorides 2l4- to 16O ppn 

Sulfates 7 to 1,172 ppm 

Total hardness 96 to 1, 2l8 ppn 

Boron O.16 to 1.11 ppm 

Percent sodium 17 to 39* 

♦Excluding the analysis of water from well 9N/33W-9A1, 
located approximately four miles east of the City of 
Orcutt, which showed 63 percent sodiimi. This well 
supplies water of good quality which is used for 
domestic piirposes. 



-12- 



Significant Water Quality Changes . Comparison of 1959 analyses with those 
of the preceding years indicates fluctuations in mineral content of ground 
water during the seven year period, with little indication of a basin-wide 
trend. Water from well 10N/3^W-19H1, located approximately three miles 
west of the City of Santa Maria, is an exception. It has exhibited a 
slight, but continuous, increase in total dissolved solids and chloride 
content each year. The chloride content of the waters from this well in- 
creased from J+3 ppm in 1955 to 9^ ppm in 1958 and to 97 ppm in 1959 • Local 
disposal of sewage waste waters to the land appears to be the cause. 



-13- 



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« 






■I 


m 












a 








































WELL NUMBER BORON 

(ppm) 

• • 

o o o 










































































































-. 
















































ri 
















r^ 


n 

1 


n 












n 


n 


n 


pn 


en 


n 


1 






- 


H 


"1 


LI 




• ^ 


^ '^ 


h 

i 




. 


B 


D 


1 


n 


3 


3 


7 


7 


7 


7 


2 


3 


5 


7 


7 


7 


3 


2 


5 


? 2 


3 


? 


1 


2 


2 


7 


2 


YEARS OF RECORD 


1 


•a: 

CM 

1 


iH 

1 


rH 
1 


rH 
« 
CM 

1 


rH 
1 

CN 


a. 

1 

o 

I-l 


rH 

1 


rH 

1 


rH 

rH 

1 


rH 

rH 
CM 

1 


CM 

CM 
i 


rH 
O 

-J 

rH 


rH 

-3 

1 


rH 

C>v 

1 


H rH 


rH 
CM 


rH 

CM 

rH 

i 

pr 

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rH 


i 

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CM 

a, 

CM 
1 


en 

rH 

M 
rH 


CM 

c^ 

rH 
1 


C^J 


WATER QUALITY RANGES 

SANTA MARIA RIVKK VALLEY 



-Hi- 



3000 



^Ronge during period of record 
T^I959 Volues 



o '-- 
-a: o 

H UN 

O OvJ 

•=> 

P *^ 

S to 



o 
o 



o 



2000 



1000 



CO 



o 
(-. 
o 

•H 



CO 
CO 



1500 




































































































1000 




































































































^00 




> 



































































































- 

















































2.0 



O 6 
cc: a 



1.0 



s 







UJ 
CO 

3 
Z 



UJ 



YEARS OF RECORD 



I 



WATER QUALITY RANGES 

SANTA MARIA RIVER VAT.LCT 



-15- 



a 

H 

O 

CO 



1^ 
o 

CO 



a- 



i 



o 























1200 _ __ 






































__ / 


1100 _ 


















/ 




















,. — / "" 




/.__ 


1000 _ 


















/ 




Well No. 10N/3i^W-19Hl j 


900 


















/__.__.. 




















1 


800 _ 


















~ 




























































































































100 - 






































'i,^../. 


8o - - 


















/ ----- 














. -^ 








60 ___ 


Well No . 10N/3i+W- 19H1 ^ - ' " T '"' 




















..--''' 


Uo 


\ 


\ 


"" 


- 


-" 


'" 




























J FMA 


MJ JASOND V 


JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 




1955 


1956 1957 1958 1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

SANTA. MAJtIA RIVER VALLEY 



.16- 



PLATE 2 







LEGEND 

. — .^^ BASIN BOUNDARY 

MONITORED WELLS 

25G1 



/ 



.--!-- 



T9N 




STATE OF CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART n- SOUTHERN CALIFORNIA 

SANTA MARIA RIVER VALLEY 

SCALE Of MILES 



1962 




LEGEND 

-— BASIN BOUNDARY 



THE RESOURCES AGENCY OF CALIFORNIA 
DEPARTMENT OF WATER RESOURCES 

SOUTHEBN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART n- SOUTHERN CALIFORNIA 



SANTA MARIA RIVER VALLEY 



Cuyama Valley (3-13) 

The Cuyama Valley ground water basin is located along the 
Cuyama River in the southeast corner of San Luis Obispo County and the 
northeast corner of Santa Barbara County. It includes portions of Kern 
and Ventura Counties also. The basin extends about 35 miles along the 
Cuyama River ranging in width from one to four miles and encompasses 
about 125 square miles; boundaries are shown on Plate 3, "Cuyama River Valley." 
Ground Water Occurrence . Unconsolidated clay, silt, and gravel, 3^000 
to U,000 feet in total thickness, compose the alluvium, terrace, and 
older continental deposits that supply nearly all the ground water in 
this area. The aJ.luvium of Recent origin is most important in the 
western part of the basin, whereas the older deposits are important in 
the eastern portion; however, many wells are perforated in both. Except 
for small areas in the south central part, the ground waters are consid- 
ered to be unconfined. Well yields range from less than 60O gpm to 
U,UOO gpm and average about 1,000 gpm. The yield of wells is least in 
the south central portion of the valley, while the higher yields are 
obtained from wells in the older continental deposits in the eastern 
portion of the basin. 

Ground Water Development and Use . Ground water in the Cuyama Valley has 
been extensively developed for irrigation needs. More recently, minor 
development has taken place for relatively new oil industry and expanding 
domestic requirements. Ground water supplies most of the local needs. 
Major Waste Discharges . Oil industry wastes constitute the largest 
disposal problem in Cuyama Valley. Althoiagh the majority of these wastes 
are discharged to injection wells, ground water could be polluted by 



-17- 



Cuyama Valley (3-13) 

The Cuyama Valley ground water basin is located along the 
Cuyama River in the southeast corner of San Luis Obispo County and the 
northeast corner of Santa Barbara County. It includes portions of Kern 
and Ventura Counties also. The basin extends about 35 miles along the 
Cuyajna River ranging in width from one to four miles and encompasses 
about 125 square miles; boundaries are shown on Plate 3, "Cuyama River Valley," 
Ground Water Occurrence . Unconsolidated clay, silt, and gravel, 3^000 
to 4,000 feet in total thickness, compose the alluvium, terrace, and 
older continental deposits that supply nearly all the ground water in 
this area. The aJ.luvium of Recent origin is most important in the 
western part of the basin, whereas the older deposits are important in 
the eastern portion; however, many wells are perforated in both. Except 
for small areas in the south central part, the ground waters are consid- 
ered to be unconfined. Well yields range from less than 60O gpm to 
4,U00 gpm and average about 1,000 gpm. The yield of wells is least in 
the south central portion of the valley, while the higher yields are 
obtained from wells in the older continental deposits in the eastern 
portion of the basin. 

Ground Water Development and Use . Ground water in the Cuyama Valley has 
been extensively developed for irrigation needs. More recently, minor 
development has taken place for relatively new oil industry and expanding 
domestic requirements. Ground water supplies most of the local needs. 
Major Waste Discharges . Oil industry wastes constitute the largest 
disposal problem in Cuyama Valley. Although the majority of these wastes 
are discharged to injection wells, ground water could be polluted by 



-17- 



spillage, defective casings, or improper sump disposal. Waters from many- 
springs and seeps, although not waste discharges, must be considered as 
possible degradents to ground water quality, since available data indi- 
cate that they are much inferior in quality to ground waters obtained 
from wells. 

Monitoring Program . The ground water monitoring program in Cuyama Valley 
was established in 1953 to detect possible impairment of ground water 
quality by oil industry wastes and mineralized springs, principally in 
the northern and northwestern part of the basin. Through a cooperative 
arrangement in which the United States Geological Survey assumed the task 
of ground water sampling in 1957^ IT samples were obtained from 10 
monitored wells and a group of three springs during 1959- 
Evaluation of Water Quality . The character of the ground water is 
generally calcium sulfate or calcium-magnesium sulfate. The water is of 
inferior quality for domestic uses because it is excessively high in 
sulfates and total dissolved solids, and is extremely hard. The ground 
waters are low to moderate in boron content and percent sodium. Although 
total mineral content is quite high, the water is used successfully for 
irrigation of a variety of crops. The analyses show the following ranges 
of important mineral constituents: 

Total dissolved solids 910 to U, 289 ppm 

Chlorides 1? to 115 ppm 

Sulfates hkS to 2,529 Ppm 

Total hardness 332 to 2,258 ppm 

Boron 0.02 to 1.23 Ppm 

Percent sodium l4 to U9 

Significant Water Quality Changes . A study of analyses of samples col- 
lected during 1959 indicates that with exceptions, as noted below, only 
minor variations in mineral quality have occurred in this period. 



-18- 



During the period December 1958 through July 1959, analyses of samples 
from well 10N/25W-23E1, located approximately 0.8 mile west of the 
intersection of Highways l66 and 399> show a decrease in sodium content 
from 239 to ll+5 ppm, and although chloride showed a decrease from 278 to 
115 ppm, the latter figure represents the highest chloride content found 
in Cuyama Valley ground water in 1959 • Analyses of water from well 
10N/26w-23P1, located approximately three miles southeast of Cuyama Ranch 
headquarters, exhibited similar characteristics during this period in 
that sodium decreased from 166 to a more normal 96 ppm and chlorides 
decreased from 29^ to 3^+ ppm. Analyses of a sample from well 
ION/25W-3OFI located about O.9 mile south of Cuyama School showed a de- 
crease from an extremely high nitrate content of kl^ ppm in December 1958 
to 58 ppm in July 1959* Water from this well is used for irrigation. 

Comparison of ground water analyses for 1959 with those of the 
previous six years shows a return to the mineral quality of the earlier 
years of record after temporary general increases in mineral content in 
the year I958. 



-19- 





J,Ronge during period of record 
U^-1959 Volues 


Uooo 
U o" 3000 

3 uA 

H OJ 

Q td 
g 

2000 

M 
CJ -H 

S5. 1000 























■ 
















































□ 














































































[— ] 














































• 


k 
















^ 






























■ 


■ 




1 


1 


















































p 
































































































































^000 




SULFATES 

(ppm) 

H r\> I 


8 8 


















































































































































y 




Jl 












■ 






































■ 


















































■ 
































1.5 




1.0 


UJ 
GO 

3 
Z 

_l 
_l 
UJ 
5 






■ 






















































y 










D 






























e 




1 


■ 


■ 





i 


B 




B 




























3 


5 


u 


I| 


3 


2 


3 


2 


2 


3 


5 






























YEARS OF RECORD 


H 

1 


OJ 

OJ 

1 

OJ 

3 


m 

CVJ 

1 



00 

1 


cy 

00 


1 
CVJ 



H 


OJ 



r-T 
CJ 

H 

1 


u 

J- 

1 


OJ 


H 

CO 
CM 


H 
1 

CM 




























WATER QUALITY RANGES 

CUYAMA VALLEY 



-20- 



M p. 
CO 



■ 1 , 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 

250 


_ _ -^"^ \ 


Well No. ION/25W-23EI ^--'' ^ 


— - ^'- -^ 


[KO ^e^^ — ^rC — ^ L 


-'--'^ .^ ^■' \ ^ 


1 no _^'"^__ - l^r- 


Well No. ION/26W-23PI 


i. 



CO 

§^ 

M E 
K ft 
O ft 



CJ 



cU'^x 


200 - ^ \ n 


'<=^ -----V-- 


Well No. ION/25W-23EI ^-^^y^ ^v 
^c^c\ . ^^ y _ — _J 


iUU - - _-_^.._-^^ ^ 


, ^ 


.^^ Well No. ION/26W-23PI 
. ._. 



CO 



ft 

ft 



l+OO - -V 


-\ 


Well No. ION/25W-3OFI , 
300 \ - 


. \ 


200 \ 


\ 


100 J 


V 


JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 


1955 1956 1957 1958 1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

CUYAMA VALLEY 



-21- 



i 
I 



,*< 



i 



6 



I 



PLATE 3 




X' 



V 



y 



\ //. 



-VENTUCOPA^ V 




^ 



\y 



^jW - 




K \ 



+ 



LEGEND 



BASIN BOUNDARY 



• MONITORED WELL 

IICI 

— FAULT LINE 



•TATE or CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART H SOUTHERN CALIFORNIA 

CUYAMA RIVER VALLEY 

SCALE OF MILES 
1 ''z I 



I 






C A L LE\N T E 



\ 



^\ /'^^' 



\ X \ y\ X X \" X f""^-"] >/" y^ 

~^-^\ yf\ \A. \.Xy^ X, 

X"" \ :^t:'' > '^>^-<^--^ ^^^>:? 



\ 
'-' \ 








\ ^-^VX \ OBISPO \ i\^''^*^''y^ -'' \ 




,A' 



"\£i"iX ,-v' 



X\ X \. 










\ ---X^- — ^^' \ HX \ 






.-'--& 






.' \ 



\X \ ^ .-Lbs Ip'adr'es m nation a^l/ \ f-o'rest -,.v\ \ 






\ XA '-^X 



BASIN BOUNDARY 
MONITOflEO WELL 
FAULT LINE 



•TATi or CALI'OHKIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

OUflLIT Y OF GROUND WATERS IN CALIFORNIA 

1959 

PifiT U. SOUTHERN CALIFORNIA 

CUYAMA RIVER VALLEY 



Los Angeles Region (No. k) 

The Los Angeles Region extends from the southeastern boundary of 
the watershed of Rincon Creek in Ventura County to the Los Angeles-Orajige 
County boundary, a distance of about 100 miles. It extends inland from 
the Pacific Ocean to the crest of the coastal mountains, an average dis- 
tance of 50 miles, and encompasses an area of about i<-,600 square miles in 
Ventura and Los Angeles Counties. The region is characterized by broad 
coastal plains and inland valleys, backed by rugged mountainous topography. 
Ventura, Santa Clara, Los Angeles, and San Gabriel Rivers are the principal 
streams in this region. 

The ground water supply of the region has been extensively devel- 
oped, suad in many areas has been exploited beyond the point of safe annual 
yield. Supplemental water is imported from Mono and Owens Valleys to the 
City of Los Angeles, and from the Colorado PtLver to areas within the 
Metropolitan Water District of Southern California. Ground water, however, 
still supplies about 50 percent of the water beneficially used in this large 
euid rapidly growing metropolitan area. 

Sixteen ground water basins, and 53 subbasins, have been identi- 
fied in the Los Angeles Region. The following five basins, subbasins, or 
areas, have conditions warranting their Inclusion in the monitoring program: 

Number 
Monitored area of wells Sampling time 

Oxnard Plain Basin (U-U.Ol) I8 Spring and fall 

West Coast Basin (14-11.02) 

Semta Monica Bay area 18 Spring and fall 

Hawthorne -Gai^ena area 6 April and October 

Torrance area 6 April and October 

-23- 



Los Angeles Region (No. ^i^) 

The Los Angeles Region extends from the southeastern "boundary of 
the watershed of Rincon Creek in Ventura County to the Los Angeles-Orange 
Coxuity boundary, a distance of about 100 miles. It extends inland from 
the Pacific Ocean to the crest of the coasted, mountains, em average dis- 
tance of 50 miles, and encompasses an. sjrea of about k,600 square miles in 
Ventura emd Los Angeles Counties. The region is characterized by broeid 
coastal plains and inleind valleys, backed by rugged mountainous topography. 
Ventura, Santa Clara, Los Angeles, and San Gabriel Rivers are the principal 
streams in this region. 

The ground water supply of the region has been extensively devel- 
oped, euid in many areas has been exploited beyond the point of safe aumusLL 
yield. Supplementeil water is in^jorted from Mono and Owens Valleys to the 
City of Los Angeles, and from the Coloreuio River to areas within the 
Metropolitem Water District of Southern California. Ground water, however, 
still supplies about 50 percent of the water beneficially used in this large 
and rapidly growing metropolitan area. 

Sixteen ground water basins, and 53 subbasins, have been identi- 
fied in the Los Angeles Region. The following five basins, subbasins, or 
areas, have conditions warreinting their inclusion in the monitoring program: 

Number 
Monitored area of wells Sampling time 

Oxnard Plain Basin (U-U.Ol) I8 Spring and feill 

West Coast Basin (14-11.02) 

Santa Monica Bay eirea 18 Spring and fall 

Hawthorne -Geu^iena area 6 April emd October 

Torrance area 6 April and October 

-23- 



Number 
Monitored area of vrells Sampling time 

Central Basin Pressure Area (I4-II.03) 

and Log Angeles Forebay Area (h-ll.Oli) h May and December 

Main San Gabriel Basin (4-13.01) 7 May and December 

Less than normal precipitation in the 1958-1959 season induced 
increased extraction of ground water throughout the region. Ground vrater 
levels showed a general decline in 1959> and were lower than those of 195^. 
A general small increase of mineral content of well waters in 1959 was 
noticed in inland areas, following the improvement of water quality result- 
ing from greater than normal precipitation in the 1957-1958 season. 

Along the coastal margins of the Oxnard Plain Basin in Ventura 
County and the West Coast Basin in Los Angeles County, the ground water 
pressure surface sloped downward from sea level to elevations of 50 "to 100 
feet below sea level at points five to ten miles inland. This landward 
slope made possible the continued intrusion of sea water into fresh ground 
water aquifers of these basins. In the West Coast Basin efforts to halt 
sea-water intrusion and to artificially replenish underground reservoirs 
with imported water were reinforced by the organization of a water replen- 
ishment district covering the Los Angeles County Coastal Plain. 

No new pollution sources were found in 1959^ and pollution effects 
were generally less noticeable than in previous years of record, due mainly 
to local governmental control of industrial waste disposal practices in the 
past few years. 



-2h- 



Oxnard Plain Basin (4-^.01) 

The Oxnard Plain Basin underlies a flat, gentle sloping plain, 
roughly triangular in shape, comprising about 73 square miles of the 
coastal portion of Ventura County. The basin borders the Pacific Ocean 
for a distance of about l6 miles and is bo\mded on the north by the 

Santa Clara River, and on the southeast by foothills of the Santa Monica I 

Movintalns, The boundaries of the basin are shown on Plate ii, "Oxnard Plain Basin." 
Ground Water Occurrence . Continental and marine sediments are the 
chief sources of ground water in this area; however, a few wells are 
supplied from fractured Tertiary volcanic rocks. The main water-bearing 
zones from the shallowest downward are the Oxnard, the Mugu, the Hueneme, 
and the Fox Canyon aquifers. All of these aquifers are believed to be 
open to the sea. Along the coastal portion of the basin the aquifers 
are confined. A semiperched groxind water body consisting chiefly of 
poor quality return irrigation water exists in the western portion of 
the basin nesir Oxnard. The yield of wells in the Oxnard Plain Basin 
ranges from 900 to 1,100 gpm. 

Ground Water Development and Uses . Ground water has been extensively 
developed to the point of serious overdraft. It is the primary water 
supply for irrigation, municipal, and industrial uses in the area. 
Major Waste Discharges . The major waste discharges in the Oxnard 
Plain Basin are domestic sewage and industrial waste waters. These 
wastes are discharged to the ocean by pipeline after treatment in sewage 
treatment plants located in Oxnard and Port Hueneme. 
Monitoring Program . The monitoring program in Oxnard Plain Basin was 
initiated in 1953 to observe chajiges in the quality of groxind water 
produced by, and to determine the extent of, sea-water intrusion in the 



-25- 



vicinity of Port Hueneme and Point Mugu. In 1959^ the program included 
the analyses of 37 samples of ground water from l8 monitored wells. 
Evaluation of Water Quality . Permeable deposits overlying the clay cap 
which confines the Oxnard Aquifer in the pressiire area contain poor 
quality waters consisting chiefly of irrigation return water. The char- 
acter is similar to that in deeper aquifers, but high concentrations of 
soluble minerals render it iinsuitable for domestic use, and class 2 or 
3 for irrigation use. A drainage system has been constructed to 
discharge this water to the ocean. There is no evidence at present 
(1959) that these perched waters have penetrated the deeper aquifers, 
but this may possibly occtir if ground water levels become sufficiently 
lowered to create nonpressure conditions. 

Available analyses show a similarity in character of waters 
in the Oxnard, Mugu, Hueneme, and Fox Canyon aquifers. The character 
is calciian to calciiim- sodium sulfate usually, and calcium-magnesium 
sulfate in limited areas. In areas of sea-water intrusion, the 
character of the waters shifts to sodium chloride. 

Ground waters from the Fox Cainyon aquifer are slightly higher 
in total dissolved solids than Oxnard aquifer waters. However, boron 
is higher in the Oxnard aquifer waters placing them in elass 2 for 
irrigation use. The ground waters of all these deeper aquifers generally 
exceed drinking water standards for total dissolved solids and sulfate 
content. Electrical conductance data place these waters predominantly 
in class 2 for irrigation use. In 1959^ the mineral content of waters 
in the forebay area and contiguous portions of the press\ire area was 
greater than that of waters in the main part of the basin. This higher 



-26- 



mineral content in the forebay areas reflected the surface recharge 
water quality. 

In general the ground waters in Oxnard Plain area are suitable 
for irrigation of most crops except those sensitive to boron. The 
waters are very hard and considered marginal for domestic use because 
of their high sulfate content. 

The analyses of the ground waters of the Oxnard Plain Basin 

show the following ranges for important mineral constituents: 

Total dissolved solids ^l6 to 19,210 ppm 

Chlorides 36 to 8,8lO ppm 

Sxafates 207 to 1,3^9 ppn 

Total hardness 303 to 5^350 ppm 

Boron 0.25 to 1.88 ppm 

Significant Water Quality Changes . Comparison of analyses of well 
waters sampled in 1959 with those of the six preceding years indicates 
that the only significant mineral quality variations have occurred in 
areas of sea-water intrusion. The status of sea-water intrusion in the 
Oxnard Plain Basin in 1959 is presented in Plate U. The lines of equal 
chloride concentration indicate that sea-water intrusion into the fresh 
water aquifers of the basin continues in two apparently separated areas, 
one in the vicinity of Point Hueneme and the other near Mugu Lagoon. 
In the Port Hueneme area between Hueneme Road eind Pleasant 
Valley Road, the ^00 ppm line of equal chloride concentration 
advanced eastward as much as 9OO feet beyond the corresponding 
line for 1958. To the west of Ventura Road there is no eviden>.e 
indicating significant northward movement of the sea-water intrusion 
front dviring the year. The water frcan well 1N/22W-20B1, located approx- 
imately seven-tenths of a mile northwest of Port Hueneme has retained 
a relatively unchanged mineral quality over the years. This well was 



-27- 



formerly believed to produce water from the Oxnard aquifer and therefore 
influenced the plotting of the isochlor lines shown on the map prepared for 
the year 1958- This well is now believed to produce water from zones below 
the Oxnard aquifer. As a result, the isochlor line in this area has been 
adjusted northwestward, based on data from adjacent wells, and does not 
necessarily represent an advance of sea water during the past year in this 
direction. 

The maximum landward advajQce of the 500 ppm isochlor in the 
vicinity of Port Hueneme remains at about 1.8 miles, but the intruded area 
has expanded laterally. Analyses of water from well 1N/22W-20R1, located 
one-third of a mile west of the City of Port Hueneme, showed a chloride 
content of 23 to 43 ppm in the early months of 1951, which increased to 
8,900 ppm in November 1956, and decreased to 5,840 ppm in May 1959. Analyses 
of water from well 1N/22W-28a2 showed continuous chloride increases from 
49 ppm in December 1956, to 71 PPm in December 1957, and to 283 ppm in Nfey 
1959' Similar increases were evident in the majority of wells in the in- 
truded area. Ifeny wells producing native quality waters in the Saviers Road 
area are showing initial indications of increasing chlorides. 

Between Port Hueneme and Point Mugu Lagoon, the chlorides increased 
noticeably in two axeas. Wells in the vicinity of duck ponds in this area 
showed chlorides increasing slowly but continuously. Ground water from 
well IN/22W-36KI, located approximately one-half mile southwest of the duck 
ponds, has increased in chloride concentration from 58 ppm in 1952 to 225 
ppm in 1959. The water from well 1N/22W-36K3, located in the duck ponds, had 
a chloride content of 1,837 PPm in November 1959. 



-28- 



An increase in chlorides in the grovrnd water from several wells 
has been detected in an eirea of about one square mile south and west of 
Hueneme and Arnold Roads. The reason for the increase has not as yet 
been determined. 

In the vicinity of Mugu Lagoon, the definite location of 
isochlor lines cannot be established, due to the absence of wells in 
key areas, and the lack of samples of ground water from some available 
(but nonsampleable ) wells. The 500 ppm isochlor line for 
1959 on Plate U is located at approximately the same position as in 
1958. 



-29- 



I 



6000 



^Ronge during oeriod of record 
Lr^l959 Volues 



y P 4000 



OJ 



-P 
CO 



o 
o 



o 



2000 



w 

00 



o 
u 
u 



CO 

w 

Eh 

< 



CO 



CO 

3 





















1 

o 

o 




p 








































tc in 

* 

• 1 




























































































tttI 

t5 




























• 


-B- 


e 




■ 


i 


■ 


^ 


N 






1 


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TOO 
600 
500 
4oo 

300 
200 

3.0 



4 fl 




,H b 


H fr^UTJ ^aflTI* 


L- 1 





2.0 



o s 

CC Pi 

O ft -I n 
03 v_- 1.0 



&fl 



a 



e 



7 I 7 I 7 I 7 I 5 kj I 7 I Y I 3 U I ^ I 7 I Y I It I 6 I 7 



n 







i 



B 



YEARS OF RECORD 



1-1 

o 



I 

cu 
cvj 



m 

On 
I 






o 

•n 

I 



CO 

CM 

I 



CO 

CM 

I 



CM 
I 

:s 

c\j 



LO 

CM 

I 



CVJ 



CM 



WATER QUALITY RANGES 

OXWAED PLAIN BASIN 



-30- 



CO 

M S 

« P, 

O P. 



^' 



9000 



8500 



8000 



7500 



7000 



6500 



6000 







/ 


Well No. 1N/22W-20R1 | 


J 


r 


/ _ 


r 


----.. / 


^::::::::::::::::::::::::::::::::r\ 


_ _ __::.........„.. 


_ _ _ _ _ _ - ^>.J - 


^7 











































1600 




































I 






































1 


1200 _ _ _ . 




































/__ 




















Well No. 1N/22W-28A2 


'!::i___ 


si 800 




































r 
^ 1 


































1 




t 

_/ 


Uoo _ __ . 


















Well No. 1N/22W-36K1 


^ r 




































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y 


^"■=-' 














-' 




-- 


''"-'' 


\ 


^ ^ _ 




\ 






.-' 


.^ 




n 






t'^ 










J FMAMJ 


JASOND JFMAMJ J ASOND. 


J FMAMJ J ASONC 


JFMAMJ JASOND 


JFMAMJ J ASOND 


19. 


55 1956 


1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

OXNARD PLAIN BASIN 



-31- 



PLATE 4 



29FI 



(3^ 



LEGEND 



BASIN BOUNDARY 
MONITORED WELL 

AREA OF CHLORIDE 
CONCENTRATIONS GREATER 
THAN 500 PPM 
SPRING OF 1959 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 
PART n SOUTHERN CALIFORNIA 

OXNARD PLAIN BASIN 



SCALE OF MILES 
''t 

19 6 2 



c:::^ 




LEGEND 



BASIN BOUNDARY 



• MONITORED WELL 

29FI 



AREA OF CHLORIDE 
CONCENTRATIONS GREATER 
THAN 500 PPM 
SPRING OF 1959 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART n SOUTHERN CALIFORNIA 

OXNARD PLAIN BASIN 

SCALE Of MILES 



West Coast Basin (^4-11.02) 

West Coast Basin is located in the southern part of Los Angeles 
County along the coast between the Cities of Santa Monica and Long Beach. 
It is about 19 miles long, has an aversige width of 9 miles, and includes 
an area of about I60 square miles. About 80 percent of the surface is a 
gently rolling, slightly eroded marine plain, while bordering highlands 
constitute the remainder. Basin boundaries are shown on Plate 5, "West Coast Basin," 
Ground Water Occurrence . The principal water-bearing deposits are of 
Pleistocene and Recent eige sind consist of alternating layers of relatively 
fine grained and coarse grained fluvial sediments . The coarse grained 
layers yield groxmd water readily to wells and are the producing aquifers 
of the basin. These aquifers can conveniently be divided into an upper and 
a lower group. 

The upper group of aquifers consists of an area of semiperched 
ground water in the central portion of the basin and the Gaspur, Gardena, 
and Gage aquifers. The ground water production from this group is of 
diminishing importance because the water quality is generally marginal or 
unsuitable for established beneficial uses. 

The lower group is composed of the Lynwood and Silverado aquifers. 
These aquifers contain ground water of good quality and continue to supply 
a large pai-t of local water needs. 

Along the Santa Monica Bay, both groups merge to form essentially 
one aquifer which outcrops in the floor of the bay. In this eirea sea-water 
intrusion of the fresh ground water supply has occurred. 

Depths to the aquifers vary from 50 to 1,200 feet. Yield of wells 
ranges from 3OO to 2,000 gpm, and averages about 5OO gpm. 



-33- 



West Coast Basin (U-11.02) 

West Coast Basin is located in the southern part of Los Angeles 
Coiinty aJ-ong the coast between the Cities of Santa Monica and Long Beach. 
It is about 19 miles long, has an average width of 9 miles, and includes 
an area of about I60 square miles. About 80 percent of the surface is a 
gently rolling, slightly eroded marine plain, while bordering highlands 
constitute the remainder. Basin boundaries are shown on Plate 5, "West Coast Basin," 
Ground Water Occurrence . The principal water-bearing deposits are of 
Pleistocene and Recent age and consist of alternating layers of relatively 
fine grained 6uad coarse grained fluvial sediments. The coarse grained 
layers yield ground water readily to wells and are the producing aquifers 
of the basin. These aquifers can conveniently be divided into an upper and 
a lower group. 

The upper group of aquifers consists of an area of semiperched 
ground water in the central portion of the basin sind the Gaspur, Gardena, 
and Gage aquifers. The ground water production from this group is of 
diminishing importance because the water quality is generally marginal or 
\msuitable for established beneficial uses. 

The lower group is composed of the Lynwood and Silverado aquifers. 
These aquifers contain groiind water of good queility euid continue to supply 
a large part of local water needs. 

Along the Santa Monica Bay, both groups merge to form essentially 
one aquifer which outcrops in the floor of the bay. In this area sea-water 
intrusion of the fresh ground water supply has occurred. 

Depths to the aquifers vary from 50 to 1,200 feet. Yield of wells 
ranges from 300 to 2,000 gpm, and averages about 5OO gpm. 






-33- 



Groiind Water Development and Use . Ground water is extensively developed 
in the West Coast Basin, supplying agricultural, industrial, and domestic 
requirements. Cultural development has chauoged over the last 20 years 
from typically agricultviral to metropolitan and industrial. Petroleum 
production, oil refining, aircraft manufacture, and related industries 
are concentrated in the hasin. Ground water supplies about 1+0 percent of 
the water requirements of the basin, the rest is provided by imported 
water. 

Major Waste Discharges . The major waste discharges in the West Coast Basin 
are oil wastes from the large oil fields and refineries in the area, and 
industrial and domestic sewage. Although most of the oil wastes axe dis- 
charged to the ocesji by pipeline, the problem of possible degradation of 
ground water through defective casing, spillage, or use of sumps still 
exists. Industrial and domestic sewage is treated at sewage plants and 
discharged to the ocean. 

Monitoring Program . The sampling program in the West Coast Basin monitors 
the ground water quality in the axea of sea-water intrusion along Santa 
Monica Bay and two areas where industrial waste discharges would have an 
effect on ground water quality, namely, the Hawthorne -Gardena area and the 
Torrance area. Each of these areas is discussed separately in the pres- 
entation that follows. 

Santa Monica Bay Area . The area monitored for sea -water intrusion 
borders the coastline of Santa Monica Bay. Wells selected for the moni- 
toring program are situated in an area of about 15 square miles, from the 
northerly limit of the City of El Segundo southward to the vicinity of the 
City of Redondo Beach. The monitoring program consists of l8 wells from 



-3U- 



which 31 water saanples were obtained in 1959- Obtaining water samples from 
the same well over a long period of time has presented a problem in this 
area because soon after a well shows prominent effects of salt-water intru- 
sion, it is generally removed from use by the owner, and routine sampling 
becomes impractical. When available, other wells are substituted for those 
removed from the sampling program. Samples of the water from wells without 
pumps are obtained periodically by Department of Water Resources and Los 
Angeles County Flood Control District mobile pumping equipment. 

Evaluation of Water Quality . The mineral character of the 
ground water not influenced by sea-water intrusion is sodium bicarbonate 
to calcium bicarbonate. In the area of sea-water intrusion, the character 
of water shifts to sodiiim chloride. In 1959^ tbe chloride concentration 
ranged from 82 to 9>800 ppm and totaJ. dissolved solids ranged from U32 to 
18,270 ppm. 

Significant Water Quality Changes . The 1959 chloride data 
indicate the continued landward advance of the sea-water intrusion front 
except in the vicinity of the Los Angeles County Flood Control District's 
barrier project located in the central section of the intnasion front near 
Manhattem Beach. In this area, the leindward movement of sea water is pre- 
vented by a pressure ridge maintained at elevations above sea level by 
injection of fresh water through wells drilled in a line peirallel to the 
coast. The landward slope of the pressure surface has resulted in em 
inleuid flow of the injected fresh water which apparently overrides and 
drives before it that portion of sea water cut off by the injected fresh 
water as it spreads. Depression of the saline water euid possible dilution 
effects axe indicated by decreases of chloride content of water collected 
from wells in its path. Isochlors shown on the map following, \rtien 

-35- 



I 



compared with the corresponding lines for 1958j show that the injection 
water mound is rapidly expanding, axid that the landward advance has aver- 
aged 500 feet in the last year. 

Northward from the barrier project, through El Segundo and Playa 
Del Rey, the ground waters extracted continued to show increases in chlorides 
in the areas of heavy inrmping. In the eireas of light pumping, the chloride 
content remained fairly constant. In the latter areas, water levels along 
the coast are at or near sea level, and the landward slope of the pressure 
surface is relatively gentle. 

Southward from the harrier project, in the Redondo Beach area, 
exploratory drilling hy the Los Angeles County Flood Control District in 
1958 revealed a previously unknown, extensive area of high chloride waters. 
Well ks/lkV-lTBT, for example, located 1.1 miles from the ocesin, producing 
water from the Silverado water-bearing zone, showed 2,370 ppm chlorides in 
Pebruaj-y 1959' The Los Angeles County Plood Control District is planning 
an extension of the barrier project in this area. 

Hawthorne -Gardena Area . This monitored area extends approximately 
from Florence Avenue, north of the City of Inglewood, to 190th Street on the 
south, and from Sep\ilveda Boulevard on the west to Alameda Boulevard on the 
east. Ground water monitoring in the Hawthorne -Gardena area was initiated 
in 1953 as a result of a recommendation by a committee of interested local 
governmental units which conducted a survey of industrial waste disposal in 
this area under the direction of the Los Angeles Regional Vfeiter Pollution 
Control Board. The monitoring prograjn is designed to detect any degrada- 
tion of ground water quality which may result from past or present oil 
well, oil refinery and other industrial wastes discharged to surface 



\ 



.36- 



channels and sumps. During 1959^ 13 water samples were obtained from six 
monitored wells in this area. 

Evaluation of Water Quality . The character of the ground 
water varies from calcium bicarbonate to calcium-sodium bicarbonate 
chloride. The ground water in the deeper zones is moderately hard to very 
hard, but is suitable for prevailing beneficial uses. Well 3S/l3W-31Fl^ 
located about one mile southeast of the City of Gardena, produces from a 
semiperched body of water and yields water of marginal quality. The anal- 
ysis of a water sample collected from this well in October 1959^ showed a 
chloride content of 326 ppm, the highest for the area. The lowest chloride 
content In sajnples from monitored wells in 1959 in the Hawthorne -Gar dena 
area was 25 ppm. Total hardness ranges from I38 to 668 ppm. 

Significant Water Quality Changes . A study of analyses of 
grotmd water samples collected during 1959 indicates that only minor varia- 
tions in mineral quality have occurred in this period. However, well 
3S/13W-3IFI showed a continual increase in mineral constituents from 1953 
to 1957> SLnd a slight decrease in 1958 and 1959* Chloride in water ft:om 
well 3S/13W-29G3 located about two miles southwest of the City of Compton 
has continued to Increase from U3 ppm in 1953 to 135 PPm in October 1959- 

Torrance Area . This monitored area In the West Coast Basin 
occupies approximately 30 square miles of the coastal plain and is bordered 
by 190th Street on the north. Pacific Coast Highway on the south. Main 
Street on the east, and Seuita Monica Bay on the west. The monitoring 
program in this eurea was instituted at the recommendation of the Los 
Angeles Regional Water Pollution Control Board following a survey of indus- 
trial waste discharges In 1953 and 195^ • Ground water quality Is monitored 



-37- 



to follow the effects resulting from the past and present disposal of 
industrial wastes. During 1959j 13 ground water samples were obtained 
from six monitoring program wells in the Torrance area. 

Evaluation of Water G^uality . The mineral character of 
ground water from the Torrance area varies widely. Sodium and calcium 
are predominant cations, while bicarbonate and sulphate predominate among 
the anions. Waters in the Gardena aquifer show evidences of local impair- 
ment in the eastern part of the monitored area. The ground waters are 
generally moderately hard to very hard, and range from good to unsuitable 
for municipal and industrial uses. Ground waters in the deeper aquifers 
range from good to excellent quality for all beneficial uses. 

In 1959> the chloride concentrations ranged from 53 'to 2l8 ppmj 
sulphates ranged from 2 to 377 ppm; and total hardness ranged from 93 to 
kkQ ppm. 

Significant Water Q^ality Changes. Waters from half of the 
monitoring wells in this area have shown little or no change in character 
or mineral content. Analyses for the remaining wells showed fluctioations, 
with little evidence of a definite trend. 



\ 



-38- 



12,000 



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WEST COAST BASIN - SANTA MONICA BAY AREA 



-39- 



J 



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WATER QUALITY RANGES 

WEST COAST BASIN - HAWTHORNE - GARDENA AREA 



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WEST COAST BASIN - TORRANCE AREA 

-Ul- 



i 



i 



["■ 
































































































































































































































































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Wf»n Nn 'Vl/l ■^W.-'STPT 


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Well No. 3S/13W- 


-29G3 


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jFf 


ylAMJ JASOND JFM 


AMJJASONDJFMAMJJASONDJ FMAMJ JASONDJFMAMJJASOND 




1955 


1956 1957 1958 1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

WEST COAST BASIN - TORRANCE AREA 



.U2- 




PLATE 5 



^7K2 



CD 



LEGEND 

BASIN BOUNDARY 

APPROXIMATE LIMITS 
OF MONITORED AREA 

MONITORED WELL 

FAULT LINES 



AREA OF CHLORIDE 
CONCENTRATION GREATER 
THAN 500 PPM 
SPRING 1959 





STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 
QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART K- SOUTHERN CALIFORNIA 

WEST COAST BASIN 



$C*I.( Of MILES 
J^ 



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LEGEND 

BASIN BOUNDARY 



APPROXIMATE LIMITS 
OF MONITORED AREA 



MONITORED WELL 

FAULT LINES 

AREA OF CHLORIDE 
CONCENTRATION GREATER 
THAN 500 PPM 
SPRING 1959 



STATE OF CALIFOBNI* 

THE RESOURCES AGENCY OF CALIFORNIA 
DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 
QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART H- SOUTHERN CALIFORNIA 

WEST COAST BASIN 



Central Basin Pressure Area and Los Angeles 
Forebay Area (U~11.03) and (h-ll.OU) ~ 

The Central Basin is located in the south central portion of 
Los Angeles County, It is bounded by the Hollywood Basin on the north, 
the West Coast Basin on the west, the Anaheim Basin of Orange County on the 
south, and a series of low hills on the east. The Central Basin is sub- 
divided into four areas: the Los Angeles Forebay Area, the Montebello 
Forebay Area, the Whittier Area, and the Central Basin Pressure Area. Of 
these four areas, the ground water monitoring program is conducted in 
portions of the Central Basin Pressure Area (U-11,03) and the Los Angeles 
Forebay Area (I4-II.0U) only. 

Except for the portion of the basin abutting the hills on the 
northeast, the predominant topography of the two areas monitored is that 
of a flat, gently sloping plain, extending approximately 25 miles from the 
Los Angeles-Orange County line northwesterly to the vicinity of the Santa 
Monica Mountains. It has an average width of 12 miles and encompasses an 
area of about 220 square miles; boundaries aire shown on Plate 6, 
Ground Water Occurrence . The principal sources of ground water are the 
Recent and Pleistocene sediments. Ground water in the Los Angeles Forebay 
Area is unconfined. Clay strata overlying the aquifers in the Central Basin 
Pressure Area confine ground waters under hydrostatic pressure. Wells yield 
up to 5^000 gallons per minute but average about 500 gallons per minute. 
Ground Water Development and Use . Ground water is extensively developed 
to supply municipal and industrial requirements. There is little irri- 
gated agriculture remaining in the Central Basin. 

Major Waste Discharges . Industrial waste waters and domestic sewage con- 
stitute the major waste discharges. These wastes are discharged to the 



-U3- 



Central Basin Pressure Area and Los Angeles 
Forebay Area (U-11.03) and (ij-ll.OU) 

The Central Basin is located in the south central portion of 
Los Angeles County, It is bounded by the Hollywood Basin on the north, 
the West Coast Basin on the west, the Anaheim Basin of Orange County on the 
south, and a series of low hills on the east. The Central Basin is sub- 
divided into four areas: the Los Angeles Forebay Area, the Montebello 
Forebay Area, the Whittier Area, and the Central Basin Pressure Area. Of 
these four areas, the ground water monitoring program is conducted in 
portions of the Central Basin Pressure Area (U-11,03) and the Los Angeles 
Forebay Area (4-ll.OU) only. 

Except for the portion of the basin abutting the hills on the 
northeast, the predominant topography of the two areas monitored is that 
of a flat, gently sloping plain, extending approximately 25 miles from the 
Los Angeles-Orange County line northwesterly to the vicinity of the Santa 
Monica Mountains. It has an average width of 12 miles and encompasses an 
area of about 220 square miles | boundaries are shown on Plate 6, 
Ground Water Occurrence . The principal sources of ground water are the 
Recent and Pleistocene sediments. Ground water in the Los Angeles Forebay 
Area is unconfined. Clay strata overlying the aquifers in the Central Basin 
Pressure Area confine ground waters under hydrostatic pressure. Wells yield 
up to 5^000 gallons per minute but average about 500 gallons per minute. 
Ground Water Development and Use . Ground water is extensively developed 
to supply municipal and industrial requirements. There is little irri- 
gated agriculture remaining in the Central Basin. 

Major Waste Discharges . Industrial waste waters and domestic sewage con- 
stitute the major waste discharges. These wastes are discharged to the 



-a3- 



ocean by sewers after treatment at a local sewage treatment plant. Dis- 
posal of brine wastes to injection wells from a few small oil fields in 
the area present a minor threat of ground water pollution. 
Monitoring Program . The ground water monitoring program is concerned with 
an area of about 30 square miles, southwest of the industrieil complex cen- 
tered in the City of Vernon, and overlying portions of both the Los Angeles 
Forebay Area and Central Basin Pressure Area. 

An investigation of industrial waste pollution of grovmd water 
in this area was conducted by the Los Angeles Water Pollution Control Board 
in 1950' Water from thirty- three wells was found to exhibit hydrocarbon 
tastes and odors, increased mineralization, or both. Although the findings 
in the investigation were not conclusive, the data indicated that the source 
of pollution was industrial wastes discharged to the ground surface which 
gravitated to the water-bearing zones directly, or possibly through defective 
or nonused wells. Monitoring was instituted to observe the duration of 
the pollution in ground waters near the ground surface, and to detect and 
follow quality changes that might occur in deeper aquifers as a result of 
downward migration of the affected waters. 

During 1959> six samples were collected from two monitored wells. 
Evaluation of Water Quality . Mineral analyses of ground water samples 
obtained over the past six yeeors show that the character of groimd water 
ranged from calcitm bicarbonate to calciiun bicaxbonate-sulfate. Analyses 
of samples collected from monitoring wells in 1959 showed that total 
dissolved solids (estimated from electrical conductivity data) ranged from 
about U60 to 600 ppm, hardness from 22l4- to 356 ppm and chlorides from 29 to 
73 ppm. Although hydrocarbon tastes and odors have been noted at times, the 
water is generally suitable for prevailing beneficial uses. 



-Uh- 



Significant Water Quality Changes . Comijarison of the mineral analyses 
for 1959 with those of the preceding five years of record showed a 
slowly continuing increase in mineral content of ground water, hut no 
marked increase in any individual constituent. Well 3S/l3W-2Bl, a 
municipal well located in the southwestern part of the City of South Gate, 
continued to show the greatest increase in mineral concentration for 
wells in the monitored area. 



-U5- 





■ -Ronge during period of record 
□^1959 Volue 


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YEARS OF RECORD 



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WATER QUALITY RANGES 

LOS ANGELES FOREBAY AREA AND 
CENTOAL BASIN PRESSURE AREA 



-li6- 



4- 

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I 



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Well No. 3S/13W-2B1 


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J FMAMJ JASOND J 


FMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 


1955 


1956 1957 1958 1959 


FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

CMTRAL BASIN PRESSURE AREA AND LOS ANGRT.KS FOREBAY AREA 



-h7- 



cc cc 






■VD 



PLATE 6 



T" 



HlH 



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Cl-. 



I-- 



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SOUTH 
Q GATE 3 6 



-yo. 



\T.2S, 



T3SJ 



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en 



N 



1— 

1^ 



LEGEND 

• ^ BASIN BOUNDARY 
2BI MONITORED WELL 
FAULT 



<</; 



fa 



/ii/f 



— I 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

CENTRAL BASIN PRESSURE AREA 
AND LOS ANGELES FOREBAY 



SCALE OF MILES 




19 6 2 



PLATES 




Main San Gabriel Basin (U-I3.OI) 

The Main San Gabriel Basin is an interior valley in the east 
central portion of Los Angeles County. The basin occupies the valley 
between the San Gabriel Mountains on the north, the San Jose and the Puente 
Hills on the east and southeast, and the Merced Hills in the south and 
west. The valley floor slopes gently to the southwest. The basin averages 
about nine miles in width and encompasses an area of approximately II5 
square miles; boundaries are shown on Plate 7, "Main San Gabriel Basin." 
Ground Water Occurrence . The principal source of ground water is alluvium 
deposited from Pleistocene to Recent times. In general, the aquifer Is a 
thick section of unconsolidated sediments and the ground water is uncon- 
fined. Wells yield up to 5*500 gallons per minute and avereige about 1,000 
gallons per minute. 

Major Waste Discharges . The major waste discharges are industrial and sew- 
age wastes, and domestic rubbish and garbage. Most of the domestic and 
industrial sewage wastes are collected by the sewerage system of the County 
Sanitation Districts of Los Angeles County and discharged to the ocean. 
Disposal of rubbish and garbage in a number of abandoned gravel pits exca- 
vated in the highly permeable alluvium of the basin is widely practiced. 
Past disposal practices have posed the threat of ground water pollution if 
the decomposable refuse should be saturated by high ground water levels or 
percolation Of applied water as rainfall. Continual efforts are being made 
by this department to urge restriction of disposal of decomposable refuse 
in these pits to elevations above expected future high ground water levels. 
Monitoring Program . The monitoring program was instituted in 1953 to in- 
vestigate the influence on ground water quality of a rapid change from 



-h9- 



Main San Gabriel Basin (U-I3.OI) 

The Main San GaTariel Basin is an interior valley in the east 
central portion of Los Angeles County. The basin occupies the valley 
between the San Gabriel Mountains on the north, the San Jose and the Puente 
Hills on the east and southeast, and the Merced Hills in the south and 
west. The valley floor slopes gently to the southwest. The basin averages 
about nine miles in width and encompasses an area of approximately II5 
square miles; boundaries are shown on Plate 7, "Main San Gabriel Basin." 
Ground Water Occurrence . The principal source of ground water is alluvium 
deposited from Pleistocene to Recent times. In general, the aquifer is a 
thick section of unconsolidated sediments and the ground water is uncon- 
fined. Wells yield up to 5»500 gallons per minute and average about 1,000 
gallons per minute. 

Major Waste Discharges . The major waste discharges are industrial and sew- 
age wastes, and domestic rubbish and garbage. Most of the domestic and 
industrisLL sewage wastes are collected by the sewerage system of the County 
Sanitation Districts of Los Angeles County and discharged to the ocean. 
Disposal of rubbish and garbage in a n\imber of abandoned gravel pits exca- 
vated in the highly permeable alluviiam of the basin is widely practiced. 
Past disposal practices have posed the threat of ground water pollution if 
the decomposable refuse should be saturated by high ground water levels or 
percolation Of appl.led \mter as rainfall. Continual efforts are being made 
by this department to urge restriction of disposal of decomposable refuse 
in these pits to elevations above expected future high ground water levels. 
Monitoring Program . The monitoring program was instituted in 1953 to in- 
vestigate the influence on ground water quality of a rapid change from 



-U9- 



agricultural use of land to urbaji and suburban development. A lag in 
providing waste disposal facilities for the rapidly growing population 
presented a threat to ground water quality. It now appears that one of 
the greatest hazeu-ds is the potential pollution of ground water "by the m 
disposal of decomposable refuse in the alluvium of the basin. 

In 1959> l5 samples were collected from seven monitoring wells in 
the Main San Gabriel Basin. 

Evaluation of Water Quality . Mineral smalyses of ground water samples 
show that the character of the ground water is predominantly calcium 
bicarbonate. Although the waters are hard to very hard, they are gener- 
ally suitable for prevailing beneficial uses. 

In. 1959.> the ranges for significant mineral constituents were: 

Total dissolved solids 14-37 to 679 ppm 

Chlorides 9 to &k ppm 

Nitrates 10 to 79 ppm 

Total hardness l65 to i;l6 ppm 

Significant Water Quality Chemges . Compajrison of analyses of ground water 

samples obtained in 1959 with those of the preceding six years shows that 

only minor variations in mineral quality have occurred in the seven years 

of record. A continuing slight increase in mineral content was noted in 

ground water throughout the basin, with the exception of saarples from well 

lS/llW-26Pa., located about two miles southeast of El Monte and west of the 

San Gabriel River. The greater increase in mineral content euid in sulfates 

for this well is attributed to ground water recharge resulting from past 

releases of Colorado River water to Walnut Creek. Well IS/IOW-I9NI showed 

a gradual return toward native character and quality after showing effects 



-50- 



from seepage of Colorado River water which was last conveyed in a canal 
near the well in 1957* Analysis of a saniple collected from this well in 
May 1959^ showed a nitrate content of 79 ppm, which exceeds the recom- 
mended limit of Uh ppm for drinking water. 



-51- 



lUOO 
1200 

^■^1000 

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M O 

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WELL NUMBER SULFATES 

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WATER QUALITY RANGES 

MAIN SAN GABRIEL BASIN 



-52- 



itOrj 



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J FMAMJ J ASOND J F 


■MAMJJASONDJFMAMJJASONDJF 


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- MAMJ J ASOND 


1955 


1956 1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

MAIN SAN GABRIEL BASIN 



-53- 




PLATE 



LEGEND 



BASIN BOUNDARY 



MONITORED WELL 



7AI 



•TATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 
PART n SOUTHERN CALIFORNIA 

MAIN SAN GABRIEL BASIN 

SCALE OF MILES 
I ''t I 




SflSlN BOUNDARY 



•TATK OP CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

ILITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART XL SOUTHERN CALIFORNIA 

MAIN SAN GABRIEL BASIN 



Lahontain Region (No. 6) 

The Lahontan Region is a part of the Great Basin of the United 
States. It comprises all drainage "basins in California east of the 
Central Valley and South Coastal areas, except those basins in the south- 
western part of the State vhich drain to the Salton Sea or the Colorado 
River. 

The region extends about 500 miles along the eastern boundary of 
the State from the Oregon state line on the north to the San Bernardino 
Mountains on the south. It is bounded on the west by the Warner Mountains, 
Sierra Nevada Range, Tehachapi, Sierra Pelona, San Gabriel, and San 
Bernardino Mountains, and on the east by the California -Nevada boundary. 
The southern boundary is the southerly drainage divide of the Mojave River. 
The region vaj-ies in width from about 10 miles at the Oregon boundary to 
about 250 miles on the south, and has an area of approximately 33*000 
square miles. It encompasses all of Mono and Inyo Counties and parts of 
Modoc, Lassen, Sierra, Placer, El Dorado, Alpine, Kern, Los Angeles, smd 
San Bernardino Counties. 

All basins in this region drain interiorly. Several very large 
dry lakes are found in basin depressions in the southern desert portion. 
Twelve hydrographic provinces comprise the main watershed areas, and 60 
ground water basins have been identified in the region. 

Little developaent of remote interior basins has occurred, and 
in these, available data indicate that ground water quality ranges from 
excellent to vmsuitable for beneficial uses. Extensive development has 
taken place in the southernmost part of the region, principally in two 
areas; Antelope Valley in Los Angeles and Kern Coimties, and Mojave River 



-55- 



Lahontaua Region (No. 6) 

The Lahontan Region is a part of the Great Basin of the United 
States. It comprises all drainage "basins in California east of the 
Central Valley and South Coastal areas, except those basins in the south- 
western i)art of the State vhich drain to the Salton Sea or the Colorado 
River . 

The region extends about 5OO miles along the eastern boundary of 
the State from the Oregon state line on the north to the San Bernardino 
Mountains on the south. It is bounded on the west by the Warner Moimtains, 
Sierra Nevada Range, Tehachapi, Sierra Pelona, San Gabriel, and San 
Bernardino Mountains, and on the east by the California-Nevada boundary. 
The southern boundary is the southerly drainage divide of the Mojave River. 
The region varies in width from about 10 males at the Oregon boundary to 
about 250 miles on the south, and has an area of approximately 33>0OO 
square miles. It encompasses all of Mono and Inyo Counties and parts of 
Modoc, Lassen, Sierra, Placer, El Dorado, Alpine, Kern, Los Angeles, and 
San Bernardino Counties. 

All basins in this region drain interiorly. Several, very large 
dry lakes are found in basin depressions in the southern desert portion. 
Twelve hydrographic provinces comprise the main watershed areas, and 60 
ground water basins have been identified in the region. 

Little development of remote interior basins has occurred, and 
in these, available data indicate that ground water quality ranges from 
excellent to unsuitable for beneficial uses. Extensive development has 
taken place in the southernmost part of the region, principally in two 
areas; Antelope Valley in Los Angeles and Kern Counties, and Mojave River 



-55- 



Valley in San Berneird.ino County. In these areas the ground water quality 
also raiiges from excellent to unsuitable for beneficial uses. 

Precipitation varies from sparse to abundant in various parts 
of the region due to extreme differences in latitude ajid elevation. The 
highest and lowest elevations in the region are lU,lt-95 feet above sea level 
at Mount Whitney and 282 feet below sea level in Death Valley. Precipita- 
tion in the major areas of ground water use is scanty, ranging from an 
annual average of kO inches on the mountain ridges to less than five inches 
in the valley areas. Usually precipitation occurs in the winter season, 
but summer storms of clcudbiirst proportions occasionally arise. 

Use of water is rapidly shifting in enrphasis from irrigation to 
miinicipal and industrial uses. In Antelope Valley, military bases and air- 
craft and missile production form a substsuitial part of the economy. How- 
ever, considerable areas of irrigated agric\ilture are still found there as 
well as in Fremont Valley euid along the Mojave River. Ground water provides 
most of the water used in the southern portion of the Lahontan Region and 
where it is extensively developed, the ground water levels are falling. 

Analyses of ground water showed that no significant quality 
changes have occurred in Antelope Valley Basin, although water levels 
continued to drop. Dissolved minerals showed a slight increase over the 
preceding year in ground waters of Lower Mojave River Valley Basin, and 
taste, odor, and foaming problems were widespread. It is because of these 
significant water quality problems that the ground water monitoring pro- 
gram for the Lahontan Region is concentrated in the Lower Mojave River 
Valley between Barstow and Yermo. In this area, 13 wells are sampled three 
times a year, in March, May, and September. 



-56- 



Lower Nbjave River Valley (6-to), Barstov to Yermo 

Lower Mojave River Valley extends from the river narrows near Barstow 
25 miles eastward along the river channel. The hasin is bounded on the north 
by hills that rise abrijptly along the southern extent of the Waterman Thrust 
fault. The southern boundary is a ridge with a maximum elevation of 3^120 
feet composed of a thick deposit of Pleistocene alluvium. The eastern limit 
of the basin is formed by a complex of interbedded volcanic and sedimentary 
rocks that rise abruptly from the river's flood plain along an erosional 
escarpment. The basin varies in width from two to seven miles, and encompasses 
about 160 square miles; boundaries are shown on Plate 8, 

Ground Water Occurrence. The iipper portion of the Lower Mjjave River ground 
water basin is a narrow and shallow deposit of river alluvixm adjacent to 
and overlying nonwater-bearing rocks. The base of the Recent alluvium is 
about 200 feet below the ground surface. A few wells are deeper and produce 
some water from the underlying and adjacent Older alluvium. The aquifers 
are unconfined. Ground water near the river is generally found within 20 
feet from the surface, and seasonal variations are usually less than 20 feet. 
Ground VJater Development and Use. Ground water currently supplies all pre- 
vailing beneficial uses. Ground water is used for domestic and municipal, 
industrial, and irrigation purposes. Military bases and railroad repair shops 
are large industrial users. 

t4ajor Waste Discharges. Major waste discharges are domestic sewage of the City 
of Barstow and the military establishments, and industrial wastes from the 
railroad repair shops. The sewage effluent from the Barstow sewage treatment 
plant is used for irrigation, and overflow is discharged to the MDjave River 
channel. Industrial waste water from the railroad shops and yards is partially 
treated in settling and skimming ponds, and the effluent is discharged to the 

river channel. 

-57- 



Significant quantities of synthetic detergents, petroleum products, 
phenols, cyanide, hexavalent chromium, sind relatively high fluoride and 
boron concentrations have been identified in these waste waters at various 
times. 

Monitoring Program . The monitoring program was instituted in 195^ follow- 
ing the recommendation by the Lahontan Regional Water Pollution Control 
Board. Ccorplaints of tastes and odors in well waters in the vicinity of 
Barstow prompted aji investigation conducted by the St^te Division of Water 
Resources in 1951 and 1952, at the request of the board. Although no evi- 
dence of pollution was fotuid in the investigation, the monitoring program 
was established to detect possible po3_Lution of ground water supplies by 
sewage and industrial waste discharges into the Mojave River channel, or 
degradation by inflow of poor quality ground water from the Older aJ.luvium 
of the foothills on the south. 

In 1958 and 1959^ sajupling was intensified to obtain additional 
data for a joint report of the board and the Department of Water Resources. 
The State Department of Public Health conducted studies of taste and odor 
problems in the investigation, and the Bureau of Sanitary Engineering made 
sanitary surveys in the area. The expanded monitoring program resulted in 
the collection of ^3 samples from 13 wells in 1959 • 

Evaluation of Water Quality . The groiind waters in the Becent alluvium of 
the river chajinel are sodium-calci\im bicarbonate in character and are gener- 
ally of good quality for prevailing beneficial uses, but fluoride is some- 
times high in an area south of the river and east of Barstow. 

Water in the Older alluvium is predominantly sodium sulfate in 
type. The water often exceeds recommended limits for drinking water in 



i 



-58- 



total dissolved solids, sulfate, fluoride, and occasionally, chloride. It 

varies from hard to very hard water. It is usually class 2 and sometimes 

class 3 irrigation water, and is very often high in boron content. 

Analyses of ground water samples obtained in 1959 showed the 

following ranges for significant mineral constituents: 

Total dissolved solids 259 to 1,285 ppm 

Chlorides 28 to 261 ppm 

Sulfates 31 to U23 ppm 

Boron 0.08 to 3«60 ppm 

Fluorides 0.3 to 3*5 Ppm 

Significant ^fater Quality Changes . Comparison of analyses of the ground 

water samples obtained in 1959 with those of the previous five years shows 

that in general only minor irregular changes in mineral quality have 

occurred. These changes appear to be influenced by magnitude of flow in 

the Mojave River. Mineral quality in general was similar to that of 1957 

after showing a slight improvement in 1958. The 1958-59 rainfall season 

was a period of deficiency following the higher than normal precipitation 

in the 1957-58 season. 

Areas where taste, odor, and foaming problems occtirred extended 
for about two and one-half miles down the river from points of major waste 
discharges. The areas affected by these qviality problems are shown on 
Plate 8. 

Well 9N/2W-1FL west of Barstow Narrows is monitored to follow 
quality changes of subsurface inflow to the basin. This well produces 
waters originating in both the river alluvium and the side slopes, reflect- 
ing quality changes associated with quantity of inflow. 

Wells 9N/1W-5J2 and -5J3, located east of Barstow and south of 
the river channel, showed prominent effects of waste discharges on ground 



-59- 



, 



water quality. These wells continue the record of ifell 9N/IW-5JI shown 
in earlier reports of this series. The data show a shift in character 
from sodium sulfate-hicaxhonate to sodium sulfate-chloride, increases in 
total dissolved solids, sulfates, and chlorides, and high fluoride emd 
horon content. Oily tastes and odors, sjid foaming have been noted in the 
ground water from these wells at v€irious times. 

Well 9N/1W-10D2, formerly reported as 9N/IW-IODI, located two 
miles east of Bar stow and south of the river channel, shows variations in 
quality following changes in recharge conditions, and ground water use and 
reuse in the basin. Water in this well, which in 1958 exhibited hydro- 
carbon tastes and odors, showed no effects in 1959 attributable to waste 
discharges. 



-60- 



2U00 



Ronge during period of record 
U *-l959 Volues 



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LOWER MOJAVE RIVER VALLEY 
BARSTOW TO YERMO 



-61- 



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JFMAMJ J ASONC 


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1955 


1956 


1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

LOWER MOJAVE RIVER VALLEY 
BARS TOW TO YERMO 



-62- 




w 

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Q a 





Well No. 9N/1W 


-5J3 




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J FMAMJ JASOND JF 


■MAMJJASONDJFMAMJJASONDJF 


NdANflJ JASOND 


J FMAMJ J ASOND 


1955 


1956 1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

LOWER MOJAVE RIVER VALLEY 
BAR3T0W TO YERMO 



-63- 



PLATE 8 




/ 



T.ION. 



T. 9 N. 




lOGl 



CD 



LEGEN D 



BASIN BOUNDARY 
MONITORED WELL 

AREA WHERE GROUND 
WATER IS AFFECTED 
BY TASTES AND ODORS 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 
PARTU SOUTHERN CALIFORNIA 

LOWER MOJAVE RIVER VALLEY BASIN 
BARSTOW TO YERMO 

SCALE OF MILES 
I 'h I 



1 



i 



PLATE 6 




Colorado River Basin Region (No. 7) 

The Colorado River Basin Region is part of the California desert 
area. It is bounded on the north by a series of mountain ridges which 
separate it from the Mojave River watershed area, on the east by the 
California-Nevada state line and the Colorado River, on the south by the 
United States -Mexico International Boundary, and on the west by the 
Peninsular and Saji Jacinto Ranges and the San Bernardino Mountains. 

The region encompasses eill of Imperial Co\uity, and parts of San 
Bernardino, Riverside, and San Diego Counties. The region's average width 
is about 125 miles, its average length is about 15O miles, and it encom- 
passes an area of about 19,370 squsLre miles. 

Topography of the region is characterized by a number of broad 
valleys containing isolated mountains and separated by mountain ranges. 
Most of the region drains to the Colorado River or to the Sal ton Sea. How- 
ever, there eire many other basins that have interior drainage and contain 
dry Isikes at their lowest elevations. Some of these dry lakes axe several 
square miles in extent. In all, h6 ground water basins have been defined 
in this region. 

Precipitation is meager in this region. The average annual rain- 
fall varies from about kO inches on mountain ridges to the west to about 
four inches in the valleys. Much of the rainfall occurs in the winter 
season, but summer storms of cloudbiirst proportions are frequent. Direct 
precipitation probably contributes very little to ground water replenish- 
ment. Recharge takes place predominantly by deep percolation of stream 
flow as it crosses the detrital cones at the mouths of canyons around the 
basins . 



-65- 



t 



Colorado River Basin Region (No. 7) 

The Colorado River Basin Region is part of the California desert 
area. It is hounded on the north hy a series of mountain ridges which 
separate it from the Mojave River watershed area, on the east by the 
California-Nevada state line and the Colorado River, on the south "by the 
United States -Mexico International Boundary, and on the west by the 
Peninsular and San Jacinto Ranges and the San Bernardino Mountains. 

The region encompasses all of Imperial. County, and parts of Saji 
Bernardino, Riverside, and Saji Diego Counties. The region's average width 
is about 125 miles, its average length is about I50 miles, and it encom- 
passes an area of about 19,370 square miles. 

Topography of the region is characterized by a number of broad 
valleys containing isolated mountains and separated by mountain ranges. 
Most of the region drains to the Colorado River or to the Salton Sea. How- 
ever, there axe many other basins that have interior drainage and contain 
dxy lakes at their lowest elevations. Some of these dry lakes are several 
square miles in extent. In all, h6 ground water basins have been defined 
in this region. 

Precipitation is meager in this region. The average annual rain- 
f8LLl varies from about kO inches on mountain ridges to the west to about 
four inches in the valleys. Much of the rainfaLLl occurs in the winter 
season, but summer storms of cloudbiirst proportions are frequent. Direct 
precipitation probably contributes very little to ground water replenish- 
ment. Recharge takes place predominantly by deep percolation of stream 
flow as it crosses the detrital cones at the mouths of canyons around the 
basins . 



-65- 



Ground water is used primarily for irrigation in several basins. 
Colorado River water is imported for irrigation use in vast areas within 
the region, and where it is utilized, ground water is used primarily for 
domestic purposes. Some ground water is used for mining operations, for 
industrial uses, and for domestic uses in a number of desert resort 
communities. 

Quality of ground water in the region varies from excellent to 
unsuitable for recognized beneficial uses. 

Increasing ground water utilization exceeds replenishment in the 
major areas of ground water use. The consequent accelerated reduction of 
the supply occasions concern for the future. Protection of all usable 
ground waters from impainnent by any source is made imperative by the vital 
importance of water in these desert areas. 

The ground vrater monitoring program in the Colorado River Basin 
Region is at present limited to the southern portion of the Coachella 
Valley. In this area, 12 wells are sangjled twice a year, in May and 
December. 



-66- 



Coachella Valley Basin (T-^l) 3outh Portion 

The Coachella Valley is located in Riverside County in the northerly 
end of a great, elongated depression named the Sal ton Sink. It extends from 
the vicinity of Bajming 75 miles southeasterly to the Sal ton Sea. The basin 
varies in v/-idth from an average of about 3 miles in the northwesterly portion 
to approximately 20 miles at Salton Sea, and has an area of about 680 square 
miles. The Salton Sea and a large part of the axea monitored are below sea 
level. Basin boundaries are shown on Plate 9, "Coachella Valley South." 
Ground Water Occurrence. The principal ground water producing sediments of 
Coachella Valley are unconsolidated alluvial debris consisting of gravel, 
sand, and silt. Fine-grained lake bed sediments cap the alluvium in the 
portion of the valley which lies between the City of Indio and the Salton 
Sea. In this area the major aquifers are confined. A shallow zone of perched 
water that overlies the principal aquifer contains predominantly an accumu- 
lation of irrigation return water and domestic waste water. The principal 
aquifer is replenished by ground water moving southeastward from the upper 
portion of the basin where ground vrater is unconfined. Water vrells in the 
monitored area yield up to 2,000 gallons per minute. 

Ground Water Development and Use. Extensive use of Colorado River water for 
irrigation since 19^9 has limited the need for ground water for irrigation 
in the southern part of Coachella Valley. However, ground water is still used 
extensively for domestic and industrial purposes. Moderate to extensive 
development of ground water has occurred in the upper portion of the basin 
where ground water, supplemented by local surface water supplies, meets all 
current requirements. 



-67- 



Major Waste Discharges. Irrigation return water constitutes the major waste 
discharge in the area monitored. Minor discharges are sewage treatment plant 
effluents used locally for irrigation, or discharged to the channel of the 
IVhitewater River. Sanitary landfill methods are used at several sites 
northwest of the City of Indio for disposal of garbage and domestic rubbish. 
Monitoring Program. The ground water monitoring program in Coachella Valley 
was instituted in 195^ to detect any changes in ground water quality produced 
by imported water or possible impairment resiilting from movement of degraded 
water from a shallow aquifer into a deeper aquifer through interconnections, 
aquifers, or through gravel packed or improperly constructed or destroyed 
wells • 

Twenty- two saii5)les were collected in 1959 from the 12 wells 
in the monitoring program. 

Evaluation of Water Quality. Ground water in the upper portion of the valley 
is predominantly calcium bicarbonate in character, good to excellent in 
quality, and low in percent sodium. Sodium sulfate waters occur locsilly in 
the vicinity of Desert Hot Springs and Garnet, in the upper part of the 
valley; these waters are generally unsuitable for irrigation and usually 
exceed drinking water standards for sulfates, total dissolved solids, and 
fluoride which ranges to more than 9 ppm. Groimd waters in the vicinity of 
Indian Wells and Indio contain relatively high concentrations of nitrates 
from an luadetermined source believed to be of natural origin. At times the 
nitrate content exceeds the tentative limit of 4i| ppm recommended for drinking 
water standards. 

The ground water character shifts toward sodium bicarbonate or 
sulfate in the southerly portion of the basin, and percent sodium ranges to 
more than 90 in ground water from wells near Salton Sea. The high percent 



-68- 



1 



sodiiJin renders the water generally unsuitable for irrigation. Limited data 

indicate that water in the semiperched zone is highly mineralized due to 

the concentration of soluble minerals by irrigation use. 

The analyses of ground water collected in 1959 show the following 

ranges for significant constituents: 

Total dissolved solids lU2 to 1,015 ppm 

Chloride 7 to 328 ppm 

Sulfate 17 to 333 ppm 

Fluoride 0.2 to 6.k ppm 

Percent sodiiim 19 to 88 

Significant Water Quality Changes. Comparison of analyses of ground water 
samples collected in 1959 with those of 1958 indicates that total dissolved 
solids content increased slightly for most of the monitored wells, continuing 
the trend to increase evident in data for the six years of record. Well 
5S/7E-33G1, located about four miles southwest of the City of Indio continued 
to show large increases in mineral content. Nitrate content in water from 
this well decreased from the high value of l4U ppm shown in 1958 analyses to 
93 PP^ in 1959, remaining much above the recommended limit of hk ppm for 
drinking water. The source of the nitrates has not been determined. 

V/ell 6s/7E-25El, located about four and one-half miles southwesterly 
of Thermal, showed a slight increase in mineral constituents in the past year. 
From 195^ to 1957 this well showed improvement of mineral quality, paxti- 
cularly in sulfate content. Well 7S/8E-22M1 showed continued high chlorides 
and sulfates, which increased significantly in I956 and 1957. Well 7S/9E-16K1 
located 3 miles northwest of Indio continued to show fluctuations in concen- 
trations of constituents as well as variations in their relative proportions. 
Fluoride content of water from this well ranged from 5-7 to 6.2 ppm in 1959- 
Well 5S/8e-33N1, located about one mile northwest of Coachella, showed 



-69- 



t 

fluoride content of up to ^.0 ppm in 1959^ although the analyses indicate 



that othervrise the water is of good mineral quality for domestic use. 

The extremely variable characteristics of the ground water ex- 
hibiting impairment of quality make any attempt to identify the sources of 
degradation difficult. Increases in sulfate content in deeper aquifers of 
the lower Coachella Valley, however, are probably due to percolation of 
return flows from irrigation with Colorado River water. 






-70- 



2000 



loOO 



i^-Ronge during period of record 
-J*^I959 Voiues 



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WATER QUALITY RANGES 

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-71- 



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195 


5 1956 1957 1958 1959 


FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

COACHET.T.A VALLEY-SOUTH END 



-72- 



I 



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1958 


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FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

COACHELLA VALLEY-SOUTH END 



-73- 



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1955 


1956 


1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

COACHELLA. VALLEY - SOUTH END 



-7U- 



PLATE 







LEGEND 



• — -^ BASIN BOUNDARY 



X 



/ 



/ 



A 



/ 






\ / 



> 



I6KI 



MONITORED WELL 



FAULT LINE 



"VT o 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 
PART 31 - SOUTHERN CALIFORNIA 

COACHELLA VALLEY SOUTH 



SCALE Of MILES 

J 2_ 



19 62. 



' 7 '■ ^ '■ 7 ^MOU NT.A I N S '^X^Z. .>•'/' // f-f 

/ / / /■ ^'^^■' 



PLATE 9 





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LEGEND 



BASIN BOUNDARY 



16KI# MONITORED WELL 



FAULT LINE 



STATI OP CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART H -SOUTHERN CALIFORNIA 

COACHELLA VALLEY SOUTH 



SC»i.£ W MILES 



Santa Ana Region (No. 8) 



Tae Santa Ana Region encompasses the entire drainage area of 
the Santa Ana River. It includes portions of Los Angeles, San Bernardino, 
PU-verside, and Orange Counties, Mountain ranges and hills bound the 
region on the northeast and southeast; the Pacific Ocean bounds it on the 
southwest, and the Los Angeles -Orange County line marks its northwestern 
boundary on the Coastal Plain. The Santa Ana River traverses the region 
in a southwesterly direction from the San Bernardino Mountains through 
the Upper Santa Ana Valley of the Santa Ana Narrows between the Puente 
Hills and Santa Ana Mountains, across the Orange County Coastal Plain, 
and flows to the ocean near Newport Beach. 

Upper Santa Ana Valley has an average width of UO miles north 
to south, 50 miles east to west, and an area of about 2,250 square miles. 
The Orange County Coastal Plain area extends inland from the ocean about 
25 miles to the Santa Ana Narrows, has an average width of about 20 miles 
and an area of approximately 550 squajre miles. 

Nine ground water basins and 27 subbasins have been identified 
in the region, three of which have ground water quality problems that 
warrant their incliosion in the ground water monitoring program. The 
basins, the number of wells sampled in each, and the times of sampling 
are listed in- the following tabiilation. 



Monitored area 



No. of 
wells 



Anaheim Basin Pressure Area (8-1, 01 ) 25 
Chino Basin (8-2.01) 8 

Bunker Hill Basin (8-2.06) 8 



Sampling time 
April and September 
March, August and December 
March, August and November 



-75- 



Santa Ana Region (No. 8) 

The Santa Ana Region encompasses the entire drainage area of 
the Santa Ana River. It includes portions of Los Angeles, San Bernardino, 
Riverside, and Orange Counties. Mountain ranges and hills bound the 
region on the northeast and southeast; the Pacific Oc^an bounds it on the 
southwest, and the Los Angeles -Orange County line marks its northwestern 
boundary on the Coastsil Plain. The Santa Ana River traverses the region 
in a southwesterly direction from the San Bernardino Mountains through 
the Upper Santa Ana Valley of the Santa Ana Narrows between the Puente 
liills and Santa Ana Mo;intains, across the Orange County Coastal Plain, 
and flows to the ocean near Newport Beach. 

Upper Santa Ana Valley has an average width of kO miles north 
to south, 50 miles east to west, and an airea of about 2,250 square miles. 
The Orange County Coastal Plain axea extends inland from the ocean about 
25 miles to the Santa Ana Narrows, has an average width of about 20 miles 
and an axea of approximately 550 square miles. 

Nine ground water basins and 27 subbasins have been identified 

in the region, three of which have ground water quality problems that 

warrant their inclusion in the ground water monitoring program. The 

basins, the number of wells sampled in each, and the times of sampling 

are listed in the following tabulation. 

No. of 
Monitored area veils Sampling time 

Anaheim Basin Pressiore Area (8-1. Ol) 25 April and September 

Chino Basin (8-2.01) 8 March, August and December 

Bunker Hill Basin (8-2.06) 8 Msurch, August and November 



-75- 



The native quality of ground water in the Upper Santa Ana 
Valley has been generally good to marginal. Poorer quality waters are 
found in a few limited areas. Records of mineral analyses indicate 
that a small but noticeable general increase in mineral concentrations 
has occiirred in the valley in the past thirty years. 

All waste water in the upper valley is discharged to the 
ground surface or to stream channels, and deep percolation of these 
waste waters constitutes involunteiry reclamation and a source of recharge 
to ground water. Use and reuse of ground water presents a threat of 
impairment of quality. 

Surface and ground water outflow from the upper valley consti- 
tutes the principeLl natiiral source of recharge of ground water in the 
Orange County Coastal Plain, Most waste waters originating on the Coastal 
Plain are discharged to the ocean. Currently, Colorado River water is 
imported and spread aloag the Santa Ana River to recharge the ground water 
supplies; this source has provided the greatest amount of recharge water 
in recent yeaxs. Colorado River water is also distributed directly to 
the water users; however, ground water supplies about 80 percent of the 
water required for prevailing beneficial uses. Ground water levels remain 
below sea level along the coast in spite of the large ground water rechajrge 
program and sea water continues to invade the fresh groiond water aquifers 
in the Coastal Plain, 



■ 76- 



Anaheim Basin Pressure Area (8-1.01) 

Anaheim Basin Pressure Area, designated East Coastal Plain 
Pressure Area in previous reports of this series, is the seaward portion 
of the Orange County Coastal Plain. It extends from the Los Angeles 
County line on the northwest, 15 miles along the ocean front to the San 
Joaquin Hills on the south. Its average inland width is about 10 miles, 
and its area is about l80 square miles| boundaries are shown on Plate 10, 

The topography is that of a low, gently sloping coastal plain, 
with a series of mesas along the coastal margin separated by gaps. 
Santa Ana River traverses the plain, and flows to the ocean through 
Santa Ana Gap just north of Newport Beach. 

Ground Water Occurrence . The major water-bearing deposits include 
continental and marine sediments of Recent, Pleistocene, and Pliocene 
age. In these sediments several aquifers have been identified, one below 
another. At the surface there is an unconfined body of perched water 
consisting largely of irrigation return and other waste waters above the 
confining sediments of the deeper aquifers. In order of depth these 
principal aquifers are the Talbert aquifer of Recent age in Santa Ana 
Gap, and its correlative Bolsa aquifer in the northwesterly portion of 
the basin, ranging from about 50 feet to nearly 200 feet below the ground 
surface; the Alpha, Beta, Meadowlark and Lamb aquifers in the Pleistocene 
deposits, ranging in depth to about 600 feet; the Pleistocene Silverado 
aquifer which may reach depths exceeding 1,000 feet; and the "Pico 
Aquifer" of Pliocene age ranging to more than 3,000 feet. In the princi- 
pal aquifers well yields range up to 2,000 gallons per minute. 



-77- 



The principal aquifers reach their greatest depths and thick- 
nesses in the central portion of the basin, and extend to the ocean 
between and beneath the coastal mesas. Faults parallel to the coastline 
impede sea water inflow to the Pleistocene and Pliocene aquifers but 
not, however, to the Recent sediments. 

Ground Water Development and Use . Ground water resources are exten- 
sively developed and production exceeds safe yield. Irrigated agricul- 
ture is the principal user of ground water, but rapid urban development 
is supplanting former agricultural lands. Water demand is increasing 
along with population growth. Imported water supplements ground water 
used for domestic and industrial pu2-poses. Imported water is also spread 
in the Santa Ana Forebay area for replenishment of ground water. 
Major Waste Discharges. Municipal wastes are collected by sewers and 
discharged to the ocean after treatment. A limited amount of sewage 
treatment plant effluent is used for irrigation. Brines produced by the 
petroleum industry are conveyed to the ocean by pipelines. Past disposal 
of oil brines to unlined earth sunips continues to influence ground water 
quality adversely in certain areas. 

Monitoring Program . The monitoring program was instituted in 1953 to 
detect any extension of areas adversely affected by past oil field brine 
disposal and to report on the status of sea-water intrusion. In 1959> 
kl samples were collected from 24 wells in the program. 

Evaluation of Water Quality . The mineral quality of native ground water 
was generaJJLy good to excellent. Ground water of higher mineral concen- 
tration occurred along the coastal fringe of the aquifers where early 



■ 78- 



ground water analyses indicated that some saline waters were present even 
before ground water supplies were developed. 

The character of water in the Recent and upper Pleistocene 
deposits is generally calcium bicarbonate. Percent sodium increases with 
depth to a marked degree in the lower Pleistocene and upper Pliocene 
deposits and the character of these waters is predominantly sodium 
bicarbonate. 

Ranges of significant constituents from 1959 analyses of ground 

water samples are: 

Total dissolved solids 222 to 7,902 ppm 

Chloride 6 to 3,8kO ppm 

Sulfate 0.2 to 337 ppm 

Percent sodiiim 12 to 82 

Significant Chsinges in Ground Water Quality . A depression of the pres- 
sure surfaces in the Talbert and Bolsa aquifers to elevations below sea 
level has induced intrusion of sea water into these aquifers. Analyses 
of ground water samples collected from the Talbert aquifer in Santa Ana 
Gap indicate the continued advance of sea-water intrusion in this 
aquifer. Ground water containing 500 ppm chloride was found as far as 
three miles inland from the coastline. The location of the 500 ppm 
chloride line is shown on the following map and the continued increases 
of chloride ion concentration in the ground water, seaward of this line, 
are shown graphically for well 6s/llW-U3, located two miles northeast 
of Huntington Beach. 

Some of the degradation appears to be the result of past 
dlsposEil of oil brines to unlined sumps on the mesas adjacent to the 
Santa Ana Gap. However, at present, the major source of ground water 
degradation has become ocean water intrusion. 



-79- 



Analyses of well waters from Bolsa Chica Mesa revealed that a 
body of saline water was spreading in aquifers beneath the mesa, inland 
from the fault zone. Initial chloride increases were shown by analyses 
of samples from wells one-half mile landward of the faults. Chlorides 
for well 5S/llW-20Q5 located about one mile east of Sunset Beach are 
plotted on the following chart to illustrate these increases. The 
source of this degradation has not been established as yet. 

Although the fault zone appears to have effectively sealed off 
the deeper aquifers from direct invasion by sea water up to the present 
time, sea water and other brines may degrade the ground water in these 
aquifers beyond the zone of faulting by vertical percolation from the 
overlying shallower aquifers. 



-80- 



\n 



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10,000 



8,000 



6,000 



l+,000 



2,000 



U,000 



3,000 



w 
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2,000 



1,000 



LU 
OD 

Z 



Ronqe during period of record 
1959 Volues 





n 


- -ji- 


■ 




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■ H ■ 


.". _ 





7 



7 



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7 



7 



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7 



YEARS OF RECORD 



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WATER QUALITY RANGES 

ANAHEIM BASIN PRESSURE AREA 



-81- 





1 -Ronge during period of record 
J^I959 Values 


SPECIFIC CONDUCTANCE 
(Micromhos at 25° C) 

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3 o o o o o 


1 1 
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a 
















































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3 
















































YEARS OF RECORD 


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1 

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WATER QUALITY RANGES 

ANAHEIM BASIN PRESSURE AREA 



-82- 



3000 



2500 



2000 



b CM 



8 "^ 

8 « 1500 

o 
o ^ 

M a 

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CO-—, 



500 



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Well No. 5S/11W-20Q5 



1 orvr\ 


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Well No. 6s/llW-lJ3 / 1 


fiCiO _ _ _ _^__ J_ 


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U.00 -> - - 




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/ 1 




^--'""' Well No. 5S/11W-20Q5 

Q .. , . ,,. __^.^___ 


JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 


1955 1956 1957 1958 1959 



I 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

ANAHEIM BASIN PRESSUEE AREA 



-83- 



PLATE 10 



LEGEND 



3R2^ 



MONITORED WELL 




\^ "highway 




CD 



FAULT LINES 

AREA OF CHLORIDE 
CONCENTRATIONS GREATER 
THAN 500 PPM 
SPRING OF 1959 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART n- SOUTHERN CALIFORNIA 



ANAHEIM BASIN PRESSURE AREA 



SCALE OF MILES 
J^ 






Chino Basin (8-2.01) 

Chino Basin is located in the northwestern part ol' the large 
Upper Santa Ana Valley. It is bounded by the San Gabriel Mountains on 
the north;, Puente Hills on the west and southwest, Jurupa Mountains and 
Pedley Hills on the south, and subsurface barriers on the east. The 
basin is about 20 miles in lengthy 12 miles in width, and has an area 
of 237 square miles. The major portion of the Chino Basin is in San 
Bernardino Coionty, its southern part is in Riverside County, and a 
small western fringe is in Los Angeles County, as shown on Plate 11. 

The principal stream draining the Chino Basin is Chino Creek, 
which, together with several small streams, flows from the San Gabriel 
Mountains southward across the Chino Basin to the Santa Ana River. The 
Santa Ana River flows westerly along the southern margin of the basin. 
Ground Water Occurrence . Ground water is obtained from the alluvial 
sediments in the basin. These sediments are of Recent and Pleistocene 
£ige and conrprise, essentially, a single aquifer. In the upper portion 
of the valley the sediments consist chiefly of coarse gravels, and 
groxmd water is unconfined. Along the southwestern margin of the valley, 
groTind water is confined under press\ire by fine grained flood plain 
sediments. Faults along the northeasterly boundary of the basin impede 
ground water inflow from adjacent basins. Wells yield from 135 gpm to 
more than 1,800 gpm. 

Groxjnd Water Development and Use . Development of ground water for 
agricultural and municipal uses is extensive and a general condition 
of overdraft exists. The greatest amoimt is used by irrigated agri- 
cult\ire; however, the development of industrial and residential areas 
is increasing the demand on the grovmd water supply. Colorado River 

\ 
-85- 



Chino Basin (8-2.01) 

Chino Basin is located in the northwestern part of the lar-^e 
Upper Santa Ana Valley. It is boimded by the 3an Gabriel Moimtains on 
the north, Puente Hills on the west and southwest, Jurupa Mountains and 
Pedley Hills on the south, and subsurface barriers on the east. The 
basin is about 20 miles in length, 12 miles in width, and has an area 
of 237 square miles. The major portion of the Chino Basin is in San 
Bernardino Co\mty, its southern part is in Riverside County, and a 
small western fringe is in Los Angeles County, as shown on Plate 11. 

The principal stream draining the Chino Basin is Chino Creek, 
which, together with several small streams, flows from the San Gabriel 
Mountains southward across the Chino Basin to the Santa Ana River. The 
Santa Ana River flows westerly along the southern margin of the basin. 
Ground Water Occurrence . Ground water is obtained from the alluvial 
sediments in the basin. These sediments are of Recent and Pleistocene 
age and ccairprise, essentially, a single aquifer. In the upper portion 
of the valley the sediments consist chiefly of coarse gravels, and 
ground water is unconfined. Along the southwestern margin of the valley, 
grovmd water is confined under press\ire by fine grained flood plain 
sediments. Favilts along the northeasterly boundary of the basin impede 
ground water inflow from adjacent basins. Wells yield from 135 SPin "to 
more than 1,800 gpm. 

Ground Water Development and Use . Development of ground water for 
agricultural and municipal uses is extensive and a general condition 
of overdraft exists. The greatest amount is used by irrigated agri- 
cvilture; however, the development of industrial and residential areas 

is increasing the demand on the ground water supply. Colorado River 

\ 
\ 

\ 

-85- ^; 



water is imported to supplement ground water supplies, and minor amounts 
of ground water are imported to or exported from the basin. 
Major Waste Discharges . Domestic sewage and industrial waste water 
consisting of cooling water, food processing, and aircraft washing 
wastes, constitute the major waste discharges. Almost all waste waters 
in the basin are returned to the land for disposal or are used for 
irrigation. A substantial quantity of waste water is inrported from the 
City of Riverside for irrigation, while a minor amoiint of waste water 
is exported to the Pomona Tri-city sewage treatment plant in Pomona. 
Hexavalent chromium and phenolic compounds in ground water 
have been traced to industrial waste disposal in the past. In 1959> 
there were no indications that these constituents continued to present 
water quality problems. 

Monitoring Program . The monitoring program was instituted in 1953 to 
detect possible impairment of ground water quality that could result 
from local disposal of domestic and industrial wastes, deep percolation 
of irrigation water, or use of water imported from the Colorado River. 
Wells for monitoring were selected from among wells located near 
significant waste discharges. In 1959^ 25 samples were collected from 
eight monitoring wells. 

Evaluation of Water Quality . The native grovind water quality was 
generally good to excellent for all prevailing beneficial uses. It 
was predominantly calciim-bicarbonate in character and moderately hard 
to very hard water. The waters were usually class 1 for irrigation use 
and acceptable for domestic use . Unin5)aired ground water preserves 
these characteristics at the present time. 



-86- 



Harder waters containing greater concentrations of total 
dissolved solids are found in the southwestern portion of the basin, 
reflecting the high mineral content of runoff from Puente Hills. 

Ranges for significant constituents in 1959 are: Total dis- 
solved solids from 207 to 83O ppn, chloride from 5 to 62 ppm, and 
nitrates from 3-^ to 69 ppn. 

Significant Changes in Ground Water (juallty . Analyses of ground water 
samples collected in 1959 indicate that a slight increase had occurred 
in total dissolved solids, chloride, and nitrate content in the 
preceding year. Increases in total dissolved solids and chloride are 
"believed to be due to use and reuse of water in the basin. Moderately 
high nitrate values are found in well waters in the northwestern i»rtlon 
of the valley, where there are no known local waste discharges, and 
have been attributed to overfertillzation of crops. In the south- 
eastern portion of the valley, ground water from wells in the vicinity 
of sewage treatment plant discharges have shown nitrate contents 
exceeding the recommended limit of kk ppm for drinking water at various 
times over the seven years of record. Analyses of ground water samples 
from well 2S/7W-23E1 located about six miles southeasterly from Chino 
shows a record of 9^ PI»i nitrate In 1953 to ^5 ppoi in 1959- Ground 
water from well 2S/7W-21L1, located about five miles south of Ontario, 
shows a nitrate content of k8 pim in 195^ increasing to 69 ppm in 1959. 
The changes are illustrated on the accompanying charts. 

A departmental report on "Ground Water Qusility Objectives, 
Chino Basin," March 1957^ to the Santa Ana Regional Water Pollution 
Control Board concluded that most of the industrieil waste disposal 
problems had been eliminated through controls instituted by the board. 



-87- 



Examination of ^n groxind water quality data reveals that a slow but 
continuing increase in dissolved minerals is occvirring. Past and present 
local disx>osal of substantially all waste water and tbe resvilteuat reuse 
of ground water promises to maintain this trend. 

Quality changes that have been detected have occurred in the 
shallower ground waters. At present there is little indication that 
deeper wells have been a^ffected. 



f 



-88- 



i4oo 



1200 



^Ronge during period of record 



Pd^-v 




u o 




^ o 

5 U^ 




EH OJ 

u 
5 -^ 


1000 




O ci 




S 




O M 




M O 




800 


[i< U 




M a 








(!<-— ' 




CO 





600 



IfOO 





















n 








1 








■ 
















■ "■" 






— ff 


u 












-& -H-=. 








ug □ 


§ 







02 
CO 






S 
ft 



cr 
lij 

CO 

Z 



UJ 



800 



600 



400 



200 



YEARS OF RECORD 



CT- 

OJ 

I 



CO 

OJ 

I 

CO 



-4- 
en 






d 



OJ 



C\J 



5! 



OJ 



1 



WATER QUALITY RANGES 

CHINO BASIN 



-89- 



. 
































P.n -L 


Well No. 2S/7W-21L1 


/ 


^n "" — -- — ^" ' 1 '"^i^ / 




CO 


g^ _.^^<1. 


^--^^ 


on 


Well No. 2S/7W-23E1 




JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 


1955 1956 1957 1958 1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

CHINO BASIN 



-90- 



PLATE 11 



56^3J_ 
I 6 



36|31 T .IS. 
I|6 T.2S. 



^ 



LEGEND 

-— . BASIN BOUNDARY 
lOMI MONITORED WELL 
FAULT LINE 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART IT SOUTHERN CALIFOR'NIA 

CHINO BASIN 



SCALE OF MILES 



19 62 




LEGEND 

■ BASIN BOUNDARY 

MONITORED WELL 
. FAULT LINE 



STATE OF CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 

1959 

PART ir SOUTHERN CALIFORNIA 

CHINO BASIN 



SCALE Of MILES 



Bunker Hill Basin (8-2.06) 

The Bunker Hill Basin is situated in the Upper Santa Ana 
Valley, extending 20 miles along the lower slope of the San Bernardino 
Mountains which botind it on the north. Its average width is about eight 
miles, and its area is about 92 square miles; Plate 12 indicates boundaries, 

The Santa Ana River and tributary streams drain its surface, 
flowing generally southwesterly across the basin. Subsurface outflow 
is controlled to a large degree by a number of faults. Chief in iiiipor- 
tance of these is the San Jacinto fault which affects ground water 
movement into the Colton Basin adjoining it on the southwest. 
Ground Water Occurrence . Ground water is obtained from the alluvial 
sediments of Recent and Pleistocene age which increase in thickness from 
zero at the foot of the mountains to about 1,000 feet in the southwestern 
portion. Near the mountains, coarse gravels represent the sediments in 
coalescing alluvial cones below the mountain canyons and free ground 
water conditions prevail. In the southwest portion, interbedded per- 
meable and relatively impermeable strata create an area of confined groiind 
water. Well yields range from l80 to 1,200 gpm. 

Ground Water Development and Use . Gro\ind water is developed extensively 
for agricultural and municipal needs; it provides for almost all local 
requirements and, in addition, large volumes are exported from the basin 
for use in adjacent areas. 

Major Waste Discharges . Industrial wastes and domestic sewage constitute 
the major waste discharges. These wastes are discharged to the surface 
of the land or to stream chsinnels. 

Monitoring Program . The monitoring program was instituted in 1953 after 
an investigation by the Division of V/ater Resources found that waste 



-91- 



r 



Bunker Hill Basin (8-2.06) 

The Bunker Hill Basin is situated in the Upper Santa Ana 
Valley, extending 20 miles along the lover slope of the San Bernardino 
Mountains which bound it on the north. Its average width is about eight 
miles, and its area is about 92 square mllesj Plate 12 indicates boundaries, 

The Santa Ana River and tributary streams drain its surface, 
flowing generally southwesterly across the basin. Subsiirface outflow 
is controlled to a large degree by a number of fa;ilts. Chief in impor- 
tance of these is the San Jacinto favilt which affects ground water 
movement into the Colton Basin adjoining it on the southwest. 
Ground Water Occurrence . Ground water is obtained from the alluvial 
sediments of Recent and Pleistocene age which increase in thickness from 
zero at the foot of the mountains to about 1,000 feet in the southwestern 
portion. Near the mountains, coarse gravels represent the sediments in 
coalescing alluvial cones below the mountain canyons and free ground 
water conditions prevail. In the southwest portion, interbedded per- 
meable and relatively impermeable strata create an area of confined ground 
water. Well yields range from l80 to 1,200 gpm. 

Ground Water Development and Use ♦ Gix>und water is developed extensively 
for agricultural and municipal needs; it provides for almost aJ-l local 
requirements and, in addition, large volumes are exported from the basin 
for use in adjacent areas. 

Major Waste Discharges . Industrial wastes and domestic sewage constitute 
the major waste discharges. These wastes are discharged to the surface 
of the land or to stream channels. 

Monitoring Program . The monitoring program was instituted in 1953 after 
aji investigation by the Division of V/ater Resources found that waste 



-91- 



discharges to the ground s\xrface from a zeolite manufacturing plant 
nesir the City of San Bernardino had adversely affected the ground water 
in the vicinity of the plant. Additional wells were later selected to 
monitor possible effects on ground water quality of discharges of waste 
waters to the land from a military air base and from the City of Redlands 
sewage treatment plant. In 1959> 23 samples were collected from eight 
monitoring wells. 

Evaluation of Water Q^ality . The character of groxind water in the 
Bunker Hill Basin is predominantly calcium carbonate. It ramges from 
moderately heird to very hard water, but meets the standards recommended 
for mineral quality of drinking water, and is class 1 for irrigation use. 

Ranges in concentrations of significant constituents in 1959 i 
were: total dissolved solids from 133 to 5l5 ppn, nitrates from 0*5 to 
29 ppn, and chlorides from 2 to 32 ppm. 

Significant Changes in Ground Water Quality . Compaxison of mineral 
analyses of ground water samples obtained in 1959 with those of the pre- 
ceding six years indicates that minor fluctuations in mineral concentra- 
tions have occurred, but that there is no definite indication of any | 
trend except as noted in the following discussion. 

Ground water from well 1S/3W-8m1, located downstream of the 
City of Redlainds sewage treatment plant, shows a continuous increase in 
total dissolved solids content from 178 ppm in August 1955 to if 35 PPm 
in July 1959. 

Ground water from wells 1N/4w-29E1 and 1N/JW-29E3, located 
about one mile south of the disposal area of the Cvilligan Zeolite Company, 
and well ln/4w-29Fl, located three- fourths mile southeast, have shown 
marked increases in mineral content during the five-year period 1955-1959' 



-92- 



I 



The mineral analyses show that the increase in mineralization was due 
primarily to gains in calcium and sulphate concentrations with parallel 
increases in chloride. Boron also showed slight but noticeable increases. 



-93- 



1000 



^Ronge during period of record 



U ^1959 Volues 



en 



a a 

a: p< 



< 



CD 

3 



o o 

So 

< LP, 

l« 

O tn 
o o 

o e 

M o 

&^ 
a -H 

K S 
CO 



800 



6oo 



UOO 



200 







»!^ 


1 

. ..■.. . 




- '-'I- - w 


._.._.«...ll 


yuB^n^ 





500 



i+00 



300 



200 



100 




YEARS OF RECORD 



WATER QUALITY RANGES 

BUNKER HILL BASIN 



-9h- 






(tut 



■*■> 



-J 















2nn 




Well No. 1NAw-29E1 / 

/ 


150 


-..::;::^.-... J -- 




:"■ /\ :: r 


'ij 100 _^e-^-?--- - H 


.._ z .r: -^^/ 




7 


50 1_ 








Well No. . 


lnAw-29fi 







M 

o 

CO 
Q 

CQ 

n 















































Uoo 
































/'■\ 






































A 




/ 


/ 


s 










300 - 
























/ 


' 1 


\' 






y 






















r 








J 


/ 












V 










200 












/ 






















\ 


\ 










-- 




'" 






























V,. 








100 






































^^-.. 


.^ 





































































Well No. IS/3W-8M 


1 






















































J FMA 


MJ JASOND 


JF MAMJ J ASOND 


J FM AM J J ASONO 


J FM AMJ JASON 


D J FMAMJ J ASOND 




1955 


1956 


1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

BUNKER HILL BASIN 



-95- 



f 



PLATE 12 



LEGEND 



^~,.^^ BASIN BOUNDARY 



9E2 • MONITORED WELL 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART H -SOUTHERN CALIFORNIA 



BUNKER HILL BASIN 



1962 



San Diego Region (No. 9) 

The San Diego Region is the drainage area of streams flowing 
to the ocean between the City of Corona Del Mar in Orange County emd the 
California-Mexico boundary. It incliides portions of Orange, Riverside, 
and San Diego Counties, It extends about 90 miles along the coast, its 
average width is about k^ miles, and its area is approximately 3,830 
square miles. Most of its surface is mountainous or hilly except for a 
narrow coastal belt which slopes gently to the ocean and consists of a 
number of wave cut terraces or mesas. 

Ground water is fo\ind in the alluvium of the stream vailleys or 

shallow alluvial fill of inland valleys. Fifty- four basins have been 

identified in the region; however, only three areas are included in the 

monitoring program. These three areas, the number of wells sajirpled in 

each, and the sampling times are: 

Monitored aire a No, of wells Sampling time 

San Luis Rey Valley 

Mission Basin (9-7, 01 ) 11 Marcii aod August 

El Cajon Valley (9-l6) 10 June and December 

Tia J\;iana Valley Basin (9-19) 11 March and October 

Precipitation in the region during the 1958-1959 season was 

much below normal. Both sirrface and undergroiond water storage declined. 

Only small increases in average mineral content are indicated by analyses 

of ground water samples collected in 1959 for ground waters in the San 

Luis Rey Valley Mission Basin or El Cajon Valley, but increases in the 

ranges of certain constituents showed that areal differences in quality 

within these basins were becoming more prominent. The small change in 



-97- 



I 



San Diego Region (No. 9) 

The San Diego Region is the drainage area of streams flowing 
to the ocean between the City of Corona Del Mar in Orange County and the 
California-Mexico boundary. It incliodes portions of Orange, Riverside, 
and San Diego Counties. It extends about 90 miles along the coast, its 
average width is about 45 miles, and its area is approximately 3,830 
square miles. Most of its surface is moimtainous or hilly except for a 
narrow coastal belt which slopes gently to the ocean and consists of a 
number of wave cut terraces or mesas. 

Ground water is fo\ind in the alliivium of the stream valleys or 

shallow alluvial fill of inland valleys. Fifty- four basins have been 

identified in the region; however, only three areas are included in the 

monitoring program. These three areas, the niiraber of wells sajnpled in 

each, and the sampling times are: 

Monitored area No. of wells Sampling time 

San Luis Rey Valley 

Mission Basin (9-7, Ol) 11 Marck and August 

El Cajon Valley (9-l6) 10 June and December 

Tia Juana Valley Basin (9-19) H March and October 

Precipitation in the region during the 1958-1959 season was 

much below normal. Both surface and linderground water storage declined. 

Only small increases in average mineral content are indicated by analyses 

of ground water samples collected in 1959 for ground waters in the San 

Luis Rey Valley Mission Basin or El Cajon Valley, but increases in the 

ranges of certain constituents showed that areal differences in quality 

within these basins were becoming more prominent. The small change in 



-97- 



average qxiality from 1958 to 1959 is probably due to the cairryover effects 
of the greater recharge of good quality water resulting from the higher 
than normal precipitation of the I957-I958 season. In the Tla Juana 
VaJJLey Basin, however, a significant increase in average mineral content 
was shown by 1959 ground water analyses data. 

Increasing availability and distribution of Colorado Tdver water 
in the coastal areas has minimized .dependence on local ground water sup- 
plies. However, the ground water basins are gaining in importance as 
reservoirs for storage of excess import water as well as local water. 



I 



-98- 



San Luis Rey Valley, Mission Basin (9-7. Ol) 

The Mission Basin occupies the lower, or oceanward, end of the 
San Luis Rey River Valley in San Diego County. It extends from the ocean 
eight miles inland to the Bonsall Narrows* The area of the basin is about six 
square miles; boundaries are shown on Plate 13, "Mission Basin, San Luis Rey Valley." 
Ground Water Occurrence . Ground water is obtained primarily from the uncon- 
solidated Recent eind Pleistocene age alluvium along the San Luis Rey River 
Channel. The Recent alluvixim, consisting of highly permeable sands ajid 
gravels, is chiefly unconfined, but near the ocean fine grained sediments 
partially confine groimd water in that area. The alluvium extends into the 
oceain and is open to intrusion by sea water. 

Underlying emd flanking the alluvium are deposits of marine sedi- 
ments consisting of slightly cemented sajids with occasional beds of shale 
or sandy shale. These marine dei)osits, which are only slightly permeable, 
contain connate water, poor in quality and high in chlorides. 

The yield from wells in the alluvium ramge up to 2,l80 gpm euad 
average 5OO gpm. 

Ground Water Development emd Use . Groiind water is extensively developed 
for irrigation and about 25 percent of the municipal water requirements of 
the cities of Oceanside and Carlsbad are obtained from wells in the basin. 
As a result of these developments, a condition of overdraft exists in the 
coastal portion of the basin. 

Major Waste Discharges . The major waste discharge is the effluent from 
the City of Oceanside Sewage Treatment Plant that is imported to the basin 
by pipeline and pumped into Whelan Lake. The effluent has been used for 
irrigation following oxidation treatment in Whelem Lake. In October 1958> 



I 



-99- 



ground water replenishment operations were begun by discharge of effluent 
from overflow of the lake to spreading grounds in the San Luis Rey River 
Channel . 

A significant waste discharge occurs from a sand and gravel 
washing operation which utilizes saline ground water. Formerly the waste 
was discharged at a point two miles from the ocean, but in 1959 'was dis- 
charged to a point farther upstream where the sediments are highly 
permeable . 

Monitoring Program . A ground water monitoring program was instituted in 
1953 to study water quality effects resulting from sea-water intrusion, 
inflow of connate waters from marine sediments which underlie and flank 
the river alluvium, and salt balance. During 1959^ 17 samples were ob- 
tained from 11 monitoring wells. 

Evaluation of Water Quality . The character of water in the basin is 
extremely variable. Calciiim, sodium, bicarbonate, emd chloride ions, 
predominate. Tixe ws.ter .Is hard to very hard and high in total dissolved 
solids and chloride. The quality varies frcm good to unacceptable accord- 
ing to the drinking water standards and from class II to III for irriga- 
tion. 

Significant Chemges in Ground Water Quality . Ground water quality changes 
during the past two years have been strongly influenced by variations in 
annual precipitation rates. The 1957-I958 rainfall year produced greater 
thsin normal precipitation after five years of below normal precipitation. 
The 1958-1959 rainfall was much below normal and as a result ground water 
levels and associated ground water quality changes reflect the precipi- 
tation and recharge changes. Ground water levels recovered substantially 
from 1957 to 1958 and groxind water quality showed general improvement in 



-100- 



the period. In 1959 ground water levels declined and a general deterior- 
ation of quality occurred. 

The wells on the monitoring program are divided into two groups 
for studies of water quality cheuiges. Sea-water intrusion was evident 
near the ocean before 1953- Ground water from 'ell 11S/5W-23E1, located 
0.7 miles fYom the ocean, has exhibited continuing increases in total 
dissolved solids and chloride in the seven years of record. Ground water 
from 'ell IIS/5W-I3QI, located 2.k miles from the ocean, showed marked 
increases in total solids and chloride between 1958 and 1959 • The absence 
of wells which could be sampled in the area of intrusion makes the advance 
of sea water difficiilt to follow, but the available data indicate that the 
intrusion has been continuous and that waters containing more than 1,000 
ppm chloride advanced by 1959 to a point two miles inland from the coast. 

Analyses of ground water samples collected from three wells near 
the City of San Luis Rey, llS/kV-QKL , 8jl, sind 8n1, showed chloride content 
ranging from U72 to 653 Ppm in 1959 and total dissolved solids from 1,66^ 
to 1,826 ppm. These high values are attributed to degradation by inflow 
of connate waters from the maj^ine sediments. 

There are no wells available for ground water monitoring immedi- 
ately below the sewage treatment plant effluent recharge area. No changes 
in ground water quality in existing wells downstream from this discharge 
were shown by 1959 analyses. Mineral analyses of the effluent from Whelem 
Lake in 1959 showed it to be inferior in mineral quality to local grotind 
water. The 1959 data for the effluent water show the following raJiges of 
significant constituents: total dissolved solids 1,600 to 1,690 ppm; 
chloride 3U0 to U96 ppm; and boron O.78 to 2.2 ppm. In 1959^ the flow 
to the recharge area averaged about two million gallons a day. 



-101- 



o 
s 

o 

Q 
O 

o 



o 

w 
a, 

CO 



o 

o 

OJ 

-p 

cd 

to 
o 

i 
o 
u 
o 



4000 



2000 







500 



400 



< Ph 
[id P. 



cn 



H 



B 









o c. 



200 



B^ 



Ronge during period of record 
1959 Volue 

















1 — 


, 


















1 


























F| 








tr\ 
































■ 








' — ' 




1 




c 


































n 


i-i 






] 




H 




• 




































n 








u 


1 1 
1 1 




























n 


- 


















1 1 
l-J 





























1200 



CO 

w 

o .-^ 
M a 
« ft 

O Qa 



o 



q: 
m 

z 



UJ 



800 



Uoo 



s 



H 



H 



s 



B 



5 6 6 7 



YEARS OF RECORD 



I 



I 



CO 
I 



o 

CO 



OS 

o 

00 



CO 
I 



I 



WATER QUALITY RANGES 

SAIJ LUIS REY VALLEY - MISSION BASIN 



-102- 



1 






pLdd - 








POOO 






.^ - 


1600 




S 




M 

m IPQO - 




1 1^ 




ssor 

(ppm 


_,,_ . , _., ., , _ ._ . ...,._ 1 


Q 




^ UOO - 






Well No. 11S/UW-8N1 


n 










800 








600 - ' ~"'^:»^_._. 


----'-""■"--^ 


,^----'""' 






^ ^00 








h-l >— 

S 200 


Well No. IIS/UW-BNI 











J FMAMJ JASOND ^ 


JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 


1955 


1956 1957 1958 1959 


FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

SAN LUIS REY VALLEY, MISSION BASIN 



-103- 



CO 



O 

CO 



a 
ft 



i ..:! 


PO OOO - - ^\ *e^ 


. /:__\ / 


T ^ 
\ / 

18.000 J J 4 - - 


,/....._..L..../ 


/ ^ 1 

16 000 - -, V L 


- -i \-t 


1 ^1 

1 )i AAA Z— _. — _ _ 


/ 


/ 

1? 000 _( 




Well No. nR/5W-23El 





ft 



10 000 . 












































































































































f 

/ 


,-^ 


^ 


^' 


\ 


\ 










































ft DOT) - 








































/ 


/ 


T-- 












\ 


\ 


\ 




,,' 


.N 


V, 






f 




' 


































/ 


r 
















/ 


/ 


/ 
























^^' 


/ 




> 


s 


\ 


1 






















^ r>rir» . 




•> 


V 


V 


,/ 


/ 


/ 


























































\ 
























D,U\JU 








































































^ 


1 






















U,000 . 
































































































































































































2 000 - 








































































































































Well No. 11,S/5W-23E1 




























. 


































































































J FMAMJ JASOND 


JFMAMJ J ASONC 


) J FMAMJ J ASONC 


) J FMAMJ J ASONDv 


J FMAMJ J ASOND 




1955 


1956 


1957 


1958 


1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

SM LUIS REY VALLEy, MISSION BASIN 



-loU- 



PLATE 13 



LEGEND 

. — BASIN BOUNDARY 

• MONITORED WELL 

I3LI 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART n -SOUTHERN CALIFORNIA 

SAN LUIS REY RIVER-MISSION BASIN 



SCALE OF MILES 
% 



19 6 2 



LEGEND 

BASIN BOUNDARY 

MONITORED WELL 




PLATE 13 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART H- SOUTHERN CALIFORNIA 

SAN LUIS REY RIVER-MISSION BASIN 

SCALE OF MILES 



.]! Cajon Valley (9-16) 

The ilL Cajon Valley is a small basin in San Diego County about 
10 miles east of the City of San Diego. It is about four miles wide and 
five miles long, and has an area of about 22 square miles. The basin is 
bounded by low hills, and opens into San Diego River Valley; boundaries are 
shown on Plate lU, "El Cajon Basin." 

Groiind Water Occurrence . Ground water is obtained principally from frac- 
tured and weathered zones in crystalline rocks. The Recent alluvium 
which extends throughout the basin to depths of about 50 feet in some 
areas, is practically devoid of water. Sediments of Tertiary age yield 
very little water because their permeabilities axe low. V7ell yields range 

from 1 to 300 gpiH' 

Ground Water Development and Use . Ground water development is extensive 
for domestic uses and to a lesser extent for agriculture and municipal 
supplies. Ground water is insufficient to meet demand, and Colorado River 
water is imported as a supplementary supply. 

I'fa.jor Waste Discharges . Effluent waste waters from two sewage treatment 
plants constitute the major waste discharges. The effluents are used for 
irrigation of parks and golf courses, and overflow is discharged to 
Forester Creek. 

Monitoring Program . The monitoring program was initiated in 1953 to detect 
changes in ground water quality which might occur due to waste discharges, 
reuse of groimd water, and importation of Colorado River water. In 1959> 
16 samples were collected from 10 monitored wells. 

.Valuation of VJater Quality . Groiind water in the basin is predominantly 
sodium chloride or sodiim- calcium chloride in character. Tlie water is hard 



-105- 



mt 



■IL Cajon Valley (9-l6) 

The El Cajon Valley is a small basin in San Diego County about 
10 miles east of the City of San Diego, It is about four miles wide and 
five miles long, and has an area of about 22 square miles. The basin is 
bounded by low hills, and opens into San Diego riiver Valley; boundaries are 
shown on Plate lU, "SI Cajon Basin." 

Ground Water Occurrence . Ground water is obtained principally from frac- 
t\ired and weathered zones in crystalline rocks. The Recent alluvium 
which extends throughout the basin to depths of about 50 feet in some 
areas, is practically devoid of water. Sediments of Tertiary age yield 
very little water because their permeabilities are low. Well yields range 
from 1 to 300 gpm. 

Ground V/ater Development and Use , Ground water development is extensive 
for domestic uses and to a lesser extent for agriculture and municipal 
supplies. Ground water is insufficient to meet demand, and Colorado River 
water is imported as a supplementeiry supply. 

I-lajor VJaste Discharges . Effluent waste waters from two sewage treatment 
plants constitute the major waste discharges. The effluents are used for 
irrigation of parks and golf courses, and overflow is discharged to 
Forester Creek, 

Monitoring Prograjn , The monitoring program was initiated in 1953 to detect 
changes in ground water quality which might occur due to waste discharges, 
reuse of ground water, and importation of Colorado River water. In 1959^ 
l6 samples were collected from 10 monitored wells, 

■Valuation of V7ater Quality , Groiind water in the basin is predominantly 
sodi\m chloride or sodivun- calcium chloride in chairacter, Tlie water is hard 



I 



-10$. 



to very hard and high in total dissolved solids, chloride, and nitrate 
content. Total dissolved solids and chloride content generally exceed 
the accepted standards for drinking vrater. 

Significant Changes in Water Quality . The quality of ground water is 
extremely variable. No general increases in mineral concentrations were 
indicated by the mineral analyses of ground water samples collected in 

1959. 

Evaluation of analyses for the seven years of record show that 
average chloride and nitrate content has decreased, but that total dissolved 
solids and sulfate content have increased. For the period of record, rapid 
increases in concentration in ground water from individual wells have 
us'ually been followed by rapid decreases, and in general follow no consist- 
ent pattern of change. 



-106- 



5^ 



la; 

solvi 

rapid 

sisi 



■-c 



Range during period of record 



1959 Voiues 



u 



I 
g 

u 
o 

H 



CM 



td 



6000 



Ij-OOO 



o 
o 
g 2000 





Uoo 



-R — — n 



CO 



^-e 



3 a 200 
p^ ft 



1200 



- 


- 




























































^ 






























1—1 














y 






































1—' 


H 


□ 


1=1 


n 




CZI 

































Q ft 



d- 



800 



1^00 



m 

Z 






B 



6267777653 



n 



I 



YEARS OF RECORD 



I 



CO 



O 



CO 



CM 



CM 

o 



^ 



» 



.. 



WATER QUALITY RANGES 

EL CAJON VALLEY 
-107- 



I 



4 




PLATE 14 




LEGEND 



BASIN BOUNDARY 



MONITORED WELLS 



3C2 



T.I5S_ 
T.I6S. 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART H - SOUTHERN CALIFORNIA 

EL CAJON BASIN 

SCILE OF MILES 



1962 




LEGEND 



^~_«^ BASIN BOUNDARY 



3C2 



MONITORED WELLS 



STATE OF CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART H - SOUTHERN CALIFORNIA 

EL CAJON BASIN 

SCALE OF MILES 
t '^I 



Tia Juana Valley Basin (9-19) 

The Tia Juana Valley Basin is located on the California- Mexico 
boundary. It extends from the ocean in 3an Diego County inland along the 
Tia Juana River into Mexico. In California the basin is about five miles 
in length, averages I.5 miles in width, and has an area of about seven square 
milesj boundaries are shown on Plate l5, "Tia Juana Basin," 

Ground Water Occurrence. Ground water is found in the alluvium which under- 
lies the Tia Juana River channel. Hydrologic observations indicate the 
presence of a shallow water-bearing zone overlying a deeper zone in most of 
the monitored area near the ocean. Both zones are composed of alluvial 
sediments, but the low permeability of the upper zone gives the lower zone 
the characteristics of a pressure aquifer. Only one zone exists in the 
inland portion of the monitored area. Well yields range from 60 to 1,500 
gallons per minute. 

Groiind V/ater Development and Use. Ground vrater is extensively developed for 
irrigation. Lesser amounts are used for municipal and domestic needs. 
Ground water supplies all uses in the basin. 

Storage of ground v/ater is highly responsive to recharge conditions 
and use. In periods of low rainfall, use of water lowers ground water levels 
to below sea level and induces intrusion of sea water. 

Major Waste Discharges. The major waste discharge is sewage from the City 
of San Ysidro. After processing at the City's sewage treatment plant, it was 
conveyed to the ocean by pipeline in 1959 • Irrigation waste water readily 
percolates to the ground water body. 

f'fonitorinc Program. The monitored area is the portion of the basin within 
California. It was included in the monitoring program in 1953 to follow 
the advance of salt water intrusion noticed in coastal wells in 19^7. In 
1959, 19 samples were collected from 11 monitoring wells. 

' -109- 



Tia Juana Valley Basin (9-19) 

The Tia Juana Valley Basin is located on the California- Mexico 
boundary. It extends from the ocean in San Diego County inland aJong the 
Tia Juana River into Mexico. In California the basin is about five miles 
in length, averages I.5 miles in width, and has an area of about seven square 
milesj boundaries are shown on Plate 15, "Tia Juana Basin," 

Ground tfater Occurrence. Ground water is found in the alluvium which under- 
lies the Tia Juana River channel. Hydrologic observations indicate the 
presence of a shallow water-bearing zone overlying a deeper zone in most of 
the monitored area near the ocean. Both zones are composed of alluvial 
sediments, but the low permeability of the upper zone gives the lower zone 
the characteristics of a pressure aquifer. Only one zone exists in the 
inland portion of the monitored area. Well yields range from 60 to 1,500 
gallons per minute. 

Ground Water Development and Use. Ground water is extensively developed for 
irrigation. Lesser amounts are used for municipal and domestic needs. 
Ground water supplies all uses in the basin. 

Storage of ground \rater is highly responsive to recharge conditions 
and use. In periods of low rainfall, use of water lowers ground water levels 
to below sea level and induces intrusion of sea water. 

Major Waste Discharges. The major waste discharge is sewage from the City 
of San Ysidro. After processing at the City's sewage treatment plant, it was 
conveyed to the ocean by pipeline in 1959. Irrigation waste water readily 
percolates to the ground water body. 

I'fonitoring Program. The monitored area is the portion of the basin within 
California. It was included in the monitoring program in 1953 to follow 
the advajice of salt water intrusion noticed in coastal wells in 1947. In 
1959, 19 samples were collected from 11 monitoring wells, 

-109- 



Evaluation of V/ater Quality. Ground water is sodium chloride in character, ,i 
and although poor in mineral quality, is used successfully for agricultural 
and domestic purposes. Degrading influences are attributed to sea-water 
intrusion, adverse salt balance, and inflow of connate water from older 
sediments. 

Significant Changes in Groxmd Water Quality. Comparison of analyses of gro\ 
water samples collected in 1959 v/^ith those of 1958 shows a general increase 
in total dissolved solids and chloride throughout the basin. Ground water 
from well l8s/2W-32P^, located about one mile inland from the coast, showed 
a chloride increase from h,600 ppm in June 1953 to 7j605 ppm in October 1959 






^ 



< = 



Ground water from well l8s/2W-32Hl, about a mile and one-half from the coast;, 
showed an increase in chloride from 875 Ppni in June 1958 to 2,730 ppm in 
October 1959^ indicating sea-water intrusion to a distance of more than one 
and one-half miles inland. 

Groimd water from wells 19S/2W-2E1 and -3A1, about 3.5 miles from 
the ocean, showed chloride contents of 791 ppm and ^6h ppm, respectively, 
in 1959- The high chlorides in these well waters is believed to be due to 
re-use of groiond water, migration of poor quality water from adjacent marine 
sediments, or both. 



■110- 


























































li 


lw^30,000 
IP o 

Is- 

u 

1 "^ 20,000 
o to 
|0 o 

io "i 

■lo-M 10,000 

CO 


■ -Ronge during period of record 
□ *-l959 Volues 


iractJ 
























































■ 






























































































ier 




















































PI 


n 
















n 


u 




























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^ 




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crees; 


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shoi/e; 


















































erig 








[— ] 










































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- 


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B 


n 


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in 






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2,000 


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fna 

etc 

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- 












































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7 


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2 


7 






























YEARS OF RECORD 




OJ 
1 


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IX 

cu 

rv- 

1 


a. 

OJ 

m 


J- 

on 


1— 1 

• 


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w 

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cv 

CO 

CTN 


i-H 
< 

1 


< 

1 


o 
1 


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r-t 

1 


1 






1 
























WATER QUALITY RANGES 

1 TIA JUMA VALLEY BASIN 



-Ul- 



















8000 


- __ 


7000 _ 1.1 


._ ,^.Li.L 


/ / 

hooo L ^ = - 1 - 


/ T 

L 1 


SOOO -,-i ^'^ J - 


Well No. 18s/2W-32P4 /^^ ~y^^ _'''' ' 


i+OOO ^__ = = -^ / J 




S 3000 / -, - 


^' / Well No. 19S/2W-5C6 / 1 


/ 

2000 ^ ^ 


___._/: .1. 


7 ^? 

1 OOO ■<: '^ 




Well No. 18S/2W-32H1 



JFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASOND 


1955 1956 1957 1958 1959 



FLUCTUATIONS OF CONSTITUENTS IN SELECTED WELLS 

TIA JUANA VALLEY BASIN 



-112- 



PLATE 15 



I 



LEGEND 



— — — . BASIN BOUNDARY 



2EI 



MONITORED WELL 



STATE OF CALIFORNIA 
THE RESOURCES AGENCY OF CALIFORNIA 

EPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 

lUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART n — SOUTHERN CALIFORNIA 

TIA JUANA BASIN 

SCALE OF MILES 
I % I 



19 62 




PLATE 15 



LEGEND 



— — — BASIN BOUNDARY 



2E1 



MONITORED WELL 



STATE OF CALIFORNIA 

THE RESOURCES AGENCY OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

SOUTHERN DISTRICT 
QUALITY OF GROUND WATERS IN CALIFORNIA 
1959 
PART It - SOUTHERN CALIFORNIA 



TIA JUANA BASIN 



SCALE OF MILES 



I 



i 



I 



i 



J 



▼ 1 



APPENDIX A 
PROCEDURES AND CRITERIA 



Page 

Laboratory Methods and Procedures • A-1 

Water Quality Criteria A-3 

Criteria for Drinking Water A-3 

Criteria for Irrigation Water A-6 

Criteria for Industrial Uses A-6 



^ 



,1 



^i 



"StJ 
Vas 



19! 
'■ ail 



Ri 
Ai 



Laboratory Methods and Procedures 

Analytical methods used in the determination of the various con- 
stituents in the following tables conform generally to those presented in 
"Standard Methods for the Examination of Water, Sewage, sind Industrial 
Wastes," a joint publication of the American Public Health Association, 
American Water Works Association, and the Federation of Sewage and 
Industrial Wastes Association, 10th edition, 1955- Analytic procedures 
described in "Methods of Water Analyses, " United States Geological Siirvey, 
1956, now in preparation for publication, have been used for the deter- 
mination of certain specific constituents. 

Table A-1 indicates the constituents analyzed for in the various 
types of analyses performed in connection with this program. 

Mineral analyses of the water samples were performed by the 
Department of Water Resources laboratories located in San Bernardino euid 
Riverside, by Terminal Testing Laboratories, Incorporated, located in Los 
Angeles, or U. S. Agricultural Consul tsjits euad Laboratories, located in 
Burbank. Ctooperating agencies which collected samples smd einalyzed them 
in their laboratories were Los Angeles County Flood Control District, San 
Bernardino County Flood Control District, Oraxige County Department of 
Agriculture, and. the Bureau of Sanitary Engineering Laboratory emd The 
Metropolitein Water District of Southern California, located in Los Angeles. 
The laboratory -vrtiich conducted and reported each minerfiO. analysis is indi- 
cated in the right hand column of the Mineral Analyses Tables. Radio- 
activity counting was performed by Isotopes Specialities Company, 
Incorporated, located in Burbank, Petroleum Engineering Associates 



A-1 



i\ 



TABLE A-1 



Types of Analysis 



Constituent 



Standard 
mineral 



Partial 
mineral 



Radiological 



Specific Conductance 


X 


X 


PH^ 




X 


X 


Total dissolved 


solids 


X 




Percent Sodium 




X 


X 


Temperature^ 




X 


X 


Calcium 




X 




Magnesium 




X 




Sodium 




X 




Potassium 




X 




Carbonate 




X 


X 


Bicarbonate 




X 


X 


Sulfate 




X 




Chloride 




X 


X 


Nitrate 




X 




Fluoride 




X 




Boron 




X 




Silica 




X 





Total Activity^ 



a. Field determination. 

b. Total activity determination is the total alpha, beta, and 
gamma activity. 



Laboratory located in Long Beach, Terminal Testing Laboratories, Incorpo- 
rated, located in Los Angeles, or the California Disaster Office Laboratory, 
located in Sacramento. 

The methods and procedures for sample preparation and determina- 
tion of radioactivity in ground vrater vere those currently recommended by 
the United States Public Health Service's Robert A. Taft Sanitary Engineer- 
ing Center, Cincinnati, Ohio. For uniformity of presentation of the 
results, they have been computed to the common basis of total radioactivity 
calculated as alpha plus beta plus gamma activity, less background activity. 
The statistical errors have been converted to one standard deviation, in 



A-2 



I 



micro-micro curies (2.22 counts per minute) per liter of water. The final 
result is expressed (symbolically) ac x+y uuc/l. This means that in a 
series of determinations on the same sample, the value of x should fall 
between x-y and x+y. 

Water Qiiality Criteria 
Criteria used by the Department of Water Resources in the evalu- 
ation of the acceptability of water for the most common beneficial, uses 
are described hereinafter. In general, the values presented herein should 
be considered only as guides to judgment, and not as absolute limiting 
stajidards. 

Criteria for Drinking Water 

Chapter 7 of the California Health and Safety Code contains laws 
and standards relating to domestic water supply. Section tolO.5 of this 
code refers to the drinking water standards promulgated by the United 
States Public Health Service for water used on interstate carriers. These 
criteria have been adopted by the State of California. They are set forth 
in detail in United States Public Health Report, Volume 6l, No. 11, 
March 15, 19^, reissued in March 1956. 

According to Section ^+.2 of the above-named report, chemical 
substances in drinking water, either natural or treated, should not exceed 
the concentrations shown in Table A-2. 

Interim standaj-ds for certain mineral constituents have recently 
been adopted by the California State Board of Public Health. Based on 
these standards, temporary permits may be issued for drinking water fail- 
ing to meet the United States Public Health Service Drinking Water 



A-3 



TABLE A-2 

LIMITING CONCENTRATIONS OF MINERAL 
CONSTITUENTS FOR DRINKING WATER 

United States Public Health Service 
Drinking Water Stajidards, 19^ 



^ . . . , : Parts per 

Constituent . -, -, ^ 

: million 



Mandatory 



Nonmandatory but Recommended Values 



I 



Fluoride (f) 1.5 

Lead (Pb) 0.1 

Selenium (Se) 0.05 

Hexavalent chromium (Cr"*"") 0.05 . 

Arsenic (As) O.O5 



i 

I 

Iron (Pe) and Mangsaiese (Mn) together O.3 

Magnesium (Mg) 125 t 

Chloride (Cl) 250 

Sulfate (SOl^) 25O 

Copper (Cu) 3.0 

Zinc (Zn) 15 

Phenolic compounds in terms of phenol 0.001 

Total solids - desirable 500 

- permitted 1,000 



Standards, provided the mineral constituents in the following tabulation 

are not exceeded. 

UPPER LIMITS OF TOTAL SOLIDS AND SELECTED MINERALS IN 
DRINKING WATER AS DELIVERED TO THE CONSUMER 

Permit Temporary Permit 

Total solids 5OO (l,000)* 1,500 ppm 

Sulfates (SOi^.) 250 (5OO)* 6OO ppm 

Chlorides (Cl) 25O (5OO)* 600 ppm 

Magnesium (Mg) 125 (125)* 150 ppm 



* Numbers in parentheses are maximum permissible, 
to be used only where no other more suitable 
waters are available in sufficient quantity for 
use in the system. 



A-k 



The California State Board of Health recently has defined the 
maxiinum safe amounts of fluoride ion in drinking water in relation to 
mean annual temperature. 



Mean annual 

temperature 

in °F 

50 

60 

70 - above 



Mean monthly maximum 
fluoride ion concentration 
in ppm 

1.5 
1.0 
0.7 



The relationship of infant methemoglobinemia (a reduction of 
oxygen content in the blood, constituting a form of asphyxia) to nitrates 
in the water supply has led to limitation of nitrates in drinking water. 
The California State Department of Public Health has recommended a tenta- 
tive limit of 10 ppm nitrogen (kk ppm nitrates) for domestic waters. 
Water containing higher concentrations of nitrates may be considered to 
be of questionable quality for domestic and municipal use. 

Limits may be established for other organic mineral substances 
if their presence in water renders it hazardous, in the judgment of state 
or local health authorities. 

An additional factor with which water users are concerned is 
hardness. Hardness is due principally to calcium and magnesium salts smd 
is generally evidenced by inability to develop suds when using soap. The 
United States Geological Survey has suggested that degrees of hardness be 
classified as shown on Table A-3. 



R 



A-5 



TABLE A-3 

Hardness Classification of Waters 
U. S. Geological Survey 



Rajige of hardness : Relative 
in parts per million : classification 

0-55 Soft 

56 - 100 Slightly hard 

101 - 200 Moderately hard 

Greater than 200 Very hard 

Criteria for Irrigation Water 

Because of the diverse climatologicaJi conditions, crops, soils, 
and irrigation practices in Caiifornia, criteria which may he set up to 
evaluate the suitahility of vater for irrigation use must necessarily be 
of a generaLL nature, and judgment must be used in their application to 
individual cases. Suggested limiting values for total dissolved solids, 
chloride concentration, percent sodium and boron concentration for three 
general classes of irrigation water axe shown in Table A-k. 

Criteria for Industrial Water 

The water quality criteria for the diversified uses of water in 
industry range from the exacting requirements for make-up water for high 
pressure boilers to the minimum requirements for water washdown and 
metallurgical processing. 

Because of the large number of industrial uses of water and 
widely varied quality requirements, it is practicable to suggest only 
very broad criteria of quality. These variable conditions make it desirable 
to consider water quality requirements in broad and genersil terms only. 



A-6 



and, where possible, for grcnips of related industries rather than individ- 
ually. Hie general quality requirements of several individual and major 
groups of water uses are listed in Tahle A-5. The values shown in this 
table are those suggested in the Progress Report of the Committee on 
Quality of Tolerance of Water for Industrial Uses in the Journal of the New 
England Water Works Association, Volume ^k, 19^+0. 



TABLE A-^ 
QUALITATIVE CLASSIFICATION OF IRRIGATION WATERS 



Chemical, properties 



Class 1 



Excellent 
to good 



(Suitable for 
most plants un- 
der any condi- 
tions of soil 
and climate ) 



Class 2 



Class 3 



Good to 
injurious 



(Possible harm- 
ful for some 
crops under 
certain soil 
conditions) 



Injurious to 
unsatisfactory 

(Harmful to 
most crops and 
\msatis factory 
for all but the 
most tolerant) 



Total dissolved solids 



In ppm 



Less than 700 



In conductance, EC x 10" Less than 1,000 1,000 
Chloride ion concentration 



TOO - 2,000 More than 2,000 
3,000 More than 3,000 



In milliequivalents 

per liter 
In ppm 

Sodium in percent of 
base constituents 

Boron in ppm 



Less than 5 
Less than 175 



Less than 60 
Less than 0.5 



5 - 10 
175 - 350 



More than 10 
More than 350 



60 - 75 More than 75 
0.5 - 2.0 More than 2.0 



A- 7 



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i 



APPENDIX B 
T/iELL DATA, ANALYSES OF GROUND WATER 

AND 
RADI0AS3AY OF GROUND WATER, 19$9 



Page 

Well Data, 1959 B-1 

Analyses of Ground Water, 1959 B-22 

Radioassay of Groiind Water, 1959 B-59 







( 

Dti 
{I 

J? 
J 
• II 



^ 



If) 

1 ^ 
I 





































>« 


(a 


to 


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QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 


DATE 


TOTAL ACTIVITY 


DATE 


WELL NUMBER 


SAMPLED 
CENTRAL COASTAL 


u uc/l° 


ANALYZED 




REGION NO. 3 






5ANTA MARIA RIVER 


VALLEY (3-12) 




SBB&M 








9N/32W-17G1 


9-29-59 


5.56 + 1.72 


2- 5-60 


9N/33W- 8K1 


9-29-59 


0.00 + 1.63 


2- 5-60 


- 9A1 


9-29-59 


0.00 + 1.58 


2- U-60 


-12R1 


9-29-59 


7.52 + 1.87 


2- I+-60 


10N/3i+W- 6ni 


9-29-59 


U.39 + 1.67 


2- I+-6O 


-i6ri 


9-29-59 


0.00 + 1.59 


2- 5-60 


-19H1 


9-29-59 


5.32 + 2.01 


2- I+-60 


-21R1 


9-29-59 


0.00 + 1.87 


2- I+-6O 


10N/35W- 1+Cl 


9-29-59 


12.1+1 + 2.05 


2- 4-60 


llN/3i+W-19Ql 


9-29-59 


7.63 + 1.71 


2- U-60 


T1N/35W-18M1 


9-29-59 


5.51 + 1.68 


2- I+-60 


IIN/36W-I3RI 


9-29-59 


10.03 ± 1.96 


2- 5-60 




aiYAMA VALLEY 


(3-13) 




10N/25W-22E1 


10- 6-59 


5.i+5 1 2.00 


2- I+-6O 


-23EI 


7-28-59 


12.1 + 2.i+3 


12- 6-59 


-3OFI 


7-28-59 


3.i+ + 2.13 


12- 6-59 


ION/26W- i^Rl 


10- 6-59 


lO.i+2 + 2.03 


2- I+-60 


-1UC4 


10- 6-59 


4.1+1 + 1.71 


2- 5-60 


ION/27W-IICI 


7-28-59 


5.3 + 3.7 





a MICROMICROCURIES PER L I T ER - PROB A BLE ERROR COM PUTE D AT ONE STA NDARD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-60 



QUALITY OF GROUND WATERS TN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 


DATE 


TOTAL ACTIVITY 


DATE 


WELL NUMBER 


SAMPLED 
LOS ANGELES 




U UC/I° 


ANALYZED 




REGION NO. it 






DXNARD PLAIN PRESSURE 


AREA (U-U.Ol) 




SBB&M 












IN/2IW-3OAI 


5- 


8-59 




4.3 + 0.7 


5-25-59 


1N/22W- ^h 


5- 


7-59 




5.6 + 0.8 


5-25-59 


- 3FU 


12- 


7-59 




9.8 + 1.87 


2-2it-60 


- 7D1 


5- 


7-59 




k.2 + 0.7 


5-25-59 


- 7D1 


12- 


2-59 




2.98 + l.9it 


5-19-60 


- 9Q3 


5- 


7-59 




k.9 1 0.8 


5-22-59 


-18EI 


5- 


7-59 




k.3 i 0.7 


5-25-59 


-20B1 


11- 


20-59 




0.32 + 1.90 


5-19-60 


-20E2 


5- 


7-59 




U.5 + 0.8 


5-25-59 


-23CI 


5- 


7-59 




h.l + 0.9 


5-22-59 


-26AI 


5- 


7-59 




3.0 + 0.9 


5-22-59 


-28A2 


5- 


7-59 




3.2 + 0.9 


5-22-59 


-28H2 


5- 


7-59 




2.9 + 0.9 


5-22-59 


-36KI 


2- 


6-59 




2.9 + 0.9 


2-25-59 




WEST 


COAST BASIN 


CU-11.02) 






SANTA MONICA BAY AREA 




2S/l5W-3i^Kl 


3- 


27-59 




3.8 + 0.9 


i^-25-59 


-3^K1 


10- 


9-59 




7.17 + 1.60 


2- 5-60 


3S/li+W- 7K2 


10- 


30-59 




0.00 + 1.89 


5-27-60 



Q MICROMICROCURIES PER L I T E R - PROB A BLE ERROR COMPUTED AT ONE STANDARD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-61 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE DATE TOTAL ACTIVITY DATE 
WELL NUMBER SAMPLED u u c/ 1° ANALYZED 

SANTA MONICA BAY AEEA (continued) 

3S/litW-30Gl U-10-59 7.8 +0.9 5-11-59 

-31A3 10-15-59 0.0 + 1.57 2- 5-bO 

-32F1 i+- 10-59 5.9 ± 0.9 i^-24-59 

-32F1 i;- 10-59 5.^ +0.9 4-24-59 

3S/15W-12H2 10-30-59 4.68 + 1.99 5-2T-60 

-25A3 10- 9-59 0.00 + 1.54 2- 5-60 

HAWTHORNE-GARDENA AEEA 

4S/13W- 6qi 4-17-59 5-2 + 0.9 5- 8-59 

4s/l4w-35El ^-15-59 5.6 +0.9 5-12-59 

TORRANCE AREA 

3S/i4w-25K4 4- 6-59 5-3 +0.9 5-11-59 

-27CI 4-14-59 3-4 + 0.9 5- 8-59 

-35M5 4-10-59 5.0 + 0.9 5- 8-59 

CENTRAL BASIN PRESSURE AREA (4-11.02) 
AND LOS ANGELES FOREBAY AREA (4-11.04) 

2s/i3w-iap4 5- 5-59 6.9 + 0.9 5-21-59 

-15N3 5- 5-59 5.3 ± 0.9 5-21-59 

MAIN SAN GABRIEL BASIN (4-13.01) 

IS/lOW- 7A1 5- 1-59 4.1 + 0.9 5-11-59 

-lOCl 5- 1-59 4.1 + 0.9 5-11-59 

-19NI 5-1-59 5.5+0.9 5-12-59 



a MICROMICROCURIES PER L I T EK - PROB A BLE ERROR COM PUT E D AT ONE STANDA RD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-62 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE DATE TOTAL ACTIVITY DATE 

WELL NUMBER SAMPLED u u c/ 1° ANALYZED 

MAIN 3M GABRIEL BASIN (4-13-01) (continued) 

is/llw-iOFi 5- 1-59 3-3 +0.8 5-12-59 

-26K1 5- 1-59 5.6 +0.9 5-12-59 

-3201 5- 1-59 h.O + 0.9 5-12-59 

-33P1 5- 1-59 5.9 ± 0.9 5-12-59 



a MICROMICROCURIES PER L I T E R - PROB A BLE ERROR COMPUTED AT ONE STANDARD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-63 



A 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 


DATE 




TOTAL ACTIVITY 


DATE 


WELL NUMBER 


SAMPLED 
LAHONTAN 


REG 




u u c 


/\° 




ANALYZED 




ION 


(NO. 


6) 






LOWER MOJAVE 


RIVER VALLEY, 


BARSTOW 


TO 


YERMO 


(6-1+0) 


RRBS-,M 
















9N/1E- IMl 


3-2U-59 






5.9 


+ 


0.9 


h- 2-59 


-15N2 


3-29-59 






7.8 


+ 


0.9 


h- 2-59 


9N/1W- 5J2 


3-2i+-59 






5.9 


+ 


0.9 


k- 2-59 


- 5J3 


11- 3-59 






6.7 


+ 


0.9 


5-27-60 


- 9G1 


3-2ii-59 






7-2 


+ 


0.9 


k- 2-59 


-10D2 


3-24-59 






3.7 


+ 


0.9 


^- 3-59 


-10D2 


11- 3-59 






2.5c 


+ 


1.98 


12- I1-59 


-lOGl 


3-26-59 






28.5 


4 


1.2 


h- 3-59 


-lOGl 


11- 3-59 






4.81 


+ 


1.99 


5-27-60 


10N/1W-32J1 


3-2ii-59 






5.8 


+ 


0.9 


h- 3-59 



a MICROMICROCURIES PER LITER -PROBABLE ERROR COMPUTED AT ONE STANDARD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF A8S0RBTI0N CORRECTION. 



B-6U 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 
WELL NUMBER 


DATE 

SAMPLED 

COLORADO RIVER B/ 


TOTAL ACTIVITY 
u uc/l° 


DATE 
ANALYZED 




^SII 


I REGION 


NO. 7 






COACKELLA VALLEY 


(T- 


21) SOUTH END 




SBB&M 
















5S/7E-I6KI 


5- 


5-59 




^.7 


+ 


0.9 


5-17-59 


-??K1 


5- 


5-59 




10.0 


+ 


1.9 


5-17-59 


-33C1 


5- 


5-59 




k.e 


+ 


0.9 


5-17-59 


-33D1 


5- 


5-59 




7.8 


+ 


0.9 


5-17-59 


-33N1 


5- 


5-59 




7.2 


+ 


0.7 


5-17-59 


6S/7E-25EI 


5- 


6-59 




2.7 


+ 


0.9 


5-19-59 


6s/8e- TPl 


5- 


6-59 




5.3 


+ 


0.9 


5-21-59 


- TPl 


12- 


16-59 




1.17 


+ 


1.77 


5-12-60 


-10A3 


5- 


6-59 




3.5 


+ 


0.9 


5-17-59 


-10A3 


12- 


27-59 




l.i+6 


+ 


1.78 


5-19-60 


-27H1 


5- 


6-59 




2.k 


+ 


0.9 


5-19-59 


6S/9E-3OCI 


5- 


6-59 




1.1 


+ 


0.9 


5-19-59 


TS/8E-PPM1 


5- 


6-59 




1.9 


+ 


0.9 


5-19-59 


7S/9E-16K1 


5- 


6-59 




1.9 


+ 


0.9 


5-19-59 



a MICROMICROCURIES PER L I T E R - PROB A BLE ERRO R COM PUT E D AT ON E STA NDA RD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION, 



^ 



B-65 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUNDWATER 



STATE 


DATE 


TOTAL ACTIVITY 


DATE 


WELL NUMBER 


SAMPLED 
SANTA ANA 


u u C 


/I 


3 


ANALYZED 




REGION NC 


. 


3 






ANAHEIM BASIN PRESSURE AREA 


(8-1.01) 




SBB&M 














5S/11W-P1M3 


3- 


6-59 


1.6 


+ 


0.9 


k- 6-59 


-?1N2 


3- 


6-59 


3.0 


+ 


0.9 


k- 7-59 


-25R2 


3- 


5-59 


3.7 


+ 


0.9 


k- 5-59 


-28H2 


3- 


5-59 


2.9 


+ 


0.9 


k- 5-59 


-29C1 


3- 


6-59 


0.2 


+ 


0.8 


k- 6-59 


-3i^F3 


3- 


5-59 


3.6 


+ 


0.9 


h- 7-59 


-36B2 


3- 


5-59 


h,6 


+ 


0.9 


h- 7-59 


-36P1 


3- 


ii-59 


3.3 


+ 


0.9 


k- 5-59 


5S/12W-12C1 


3- 


9-59 


0.5 


+ 


0.9 


h- 5-59 


6S-10W- 5C1 


3- 


16-59 


2.0 


+ 


0.9 


4- 5-59 


- 5M1 


2- 


27-59 


8.2 


+ 


0-9 


4- 4-59 


- 6L2 


2- 


27-59 


1.9 


+ 


0.8 


4- 4-59 


- 7D3 


2- 


27-59 


3.1 


+ 


0.8 


4- 4-59 


- 7G1 


2- 


27-59 


0.3 


+ 


0.9 


4- 5-59 


-i8b4 


3- 


3-59 


2.5 


+ 


0.9 


4- 7-59 


6S/IIW- 131 


3- 


6-59 ' 


5.2 


+ 


0.9 


4- 6-59 


- 1J3 


3- 


3-59 


2.0 


+ 


0.9 


4- 7-59 


- 3R2 


3- 


6-59 


i+.O 


+ 


0.9 


4- 6-59 



i 



a MICROMICROCURIES PER LITER -PROBABLE ERROR COMPUTED AT ONE STANDARD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-66 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 
WELL NUMBER 


DATE 
SAMPLED 


TOTAL ACTIVITY 

u uc/l° 


DATE 
ANALYZED 




CHINO BASIN (8-2.01) 






SBB&M 










is/ 6W-29R1 


12-17-59 


5.i^3± 


1.8U 


5-19-60 


is/ 7W-28R1 


3-26-59 


1.7 i 


0.9 


5- 6-59 


-28R1 


12-17-59 


0.00 + 


1.75 


5-12-60 


is/ 7w-34^a 


3-13-59 


k.i + 


0.8 


U-20-59 


-3l4Ml 


9-21-59 


h.3 i 


2.09 


12- 3-59 


2s/ Tw-ioa 


3-26-59 


3-3 1 


0.9 


5- 6-59 


-lOMl 


12-17-59 


0.00 + 


2.23 


5-12-60 


-15A1 


12-17-59 


U.12 + 


1.79 


5-12-60 


-21L1 


3-26-59 


2.6 + 


0.9 


i^-27-59 


-?1T,1 


12-17-59 


0.93 ± 


1.77 


5-12-60 


-23EI 


3-26-59 


U.6 + 


0.9 


^-27-59 


-23EI 


12-17-59 


3.56 + 


1.8 


5-12-60 


-2TA1 


3-26-59 


3.2 + 


0.8 


5- 5-59 


-2TA1 


5-19-59 


k.6 + 


0.9 


6- U-59 


-27A1 


12-17-59 


3.56 + 


1.8 


5-12-60 




BUNKER HILL 


BASIN (8-2. ( 


36) 




SBB&M 










IN/ i+W-29El 


3-12-59 


k.8 + 


0.9 


U-13-59 


-29F1 


3-12-59 


k.9 + 


0.9 


1^-13-59 


-29FI 


9-16-59 


8.3 + 


2.19 


12- 3-59 


a MICROMICROCURIES PER 
DEVIATION IN MICROMICRO 


LIT ER - PROBABLE ERROR ( 
CURIES PER LITER WITHOUT 


;OMPUTED AT ONE STANDARD 
SELF ABSORBTION CORRECTION 



B-67 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 
WELL NUMBER 


DATE 
SAMPLED 

BUNKER HILL " 


TOTAL ACTIVITY 
u u c/ 1° 


DATE 
ANALYZED 




BASIN (8-2 


.06) (continued) 


SBB&M 












IS/3W- 8M1 


3-10-59 


18.0 


+ 


1.1 


4-13-59 


- 9E2 


3-12-59 


8.7 


+ 


0.9 


4-20-59 


- 9E2 


9-16-59 


0.00 


+ 


— 


12- 4-59 


-i6ai 


3-17-59 


10.0 


+ 


0.9 


4-20-59 


-i6ai 


4-19-59 


2.5 


+ 


1.88 


12- 6-59 


lsAw-l3F3 


3-12-59 


5.5 


+ 


0.9 


4-14-59 


-13F3 


9_ll^_59 


3.9 


+ 


2.13 


12- 6-59 


-13G1 


3-12-59 


G.6 


+ 


0.9 


4-14-59 


-13G1 


9-14-59 


0.00 


+ 


— 


12- 6-59 


-13L1 


3-12-59 


5.1 


+ 


0.9 


4-14-59 


-13L1 


9-14-59 


e.e 


+ 


2.19 


12- 6-59 



I 



I 



a MICROMICROCURIES PER LITER -PROBABLE ERROR COMPUTED AT ONE STANDARD 
DEVIATION IN MICROM ICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-68 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 


DATE 


TOTAL ACTIVITY 


DATE 


WELL NUMBER 


SAMPLED 

SAN DIEGO 


u uc/l° 




ANALYZED 




REGION No. 9 








RAN TJITS RKY VAT.T.KY 


, MISSION BASIN (9-7-01) 




SBB&M 










113/i+W- 1+Nl 


3-27-59 


7.3 ± 


0.9 


U-17-59 


- UNI 


10- 7-59 


2.53 ± 


1.72 


2- i+-60 


- 5K1 


3-27-59 


5-5 + 


0.9 


i^-17-59 


- 5K1 


10- 7-59 


0.82 + 


1.59 


2- 5-60 


- 8H1 


3-27-59 


3-9 ± 


0.9 


h-11-59 


- 8H1 


10- 7-59 


13.61 + 


2.05 


2- i+-6o 


- 8J1 


3-27-59 


2.2 + 


0.8 


u-15-59 


- 8J1 


10- 7-59 


0.0 + 


1.50 


2- 4-60 


- 8N1 


3-27-59 


2.0 + 


0.8 


i+-15-59 


- 8N1 


10- 7-59 


0.73 + 


1.68 


2- 4-60 


-18C9 


10- 7-59 


0.0 + 


1.8U 


2- 5-60 


-18L4 


10- 7-59 


1.35 ± 


1.51 


2- 5-60 


IIS/5W-13LI 


3-26-59 


k.6 + 


0.9 


k- 3-59 


-13LI 


10- 7-59 
EL CAJON 


0.19 + 

VATJ.KY (9-16) 


1.68 


2- i^-6o 


i5s/iE-3iia 


12-15-59 


2.91 + 


1.87 


2-2U-60 


163/iw- IGl 


12-15-59 


0.00 + 


1.68 


5-12-60 


- 2K6 


12-15-59 


0.00 + 


1.66 


5-12-60 


-lODl 


12-15-59 


9.05 1 


1.87 


5-12-60 



a MICROMICROCURIES PER L I T E R - PROB A BLE ERROR CO M PUT E D AT ON E STANDA RD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-69 



QUALITY OF GROUND WATERS IN CALIFORNIA 
RADIOASSAY OF GROUND WATER 



STATE 


DATE 


TOTAL ACTIVITY 


DATE 


WELL NUMBER 


SAMPLED 
EL CAJON 


u u c/ 1 


a 




ANALYZED 




VALLEY (9- 16) (continued) 




16S/1W-10E2 


12-15-59 


10.38 


+ 


1.87 


5-12-60 


-15K2 


12-15-59 


3.6i+ 


+ 


1.85 


2-17-60 




TIA JUANA VALLEY BASIN (9-19) 




18S/2W-32H1 


3-18-59 


3.1 


+ 


0.9 


5- 6-59 


-32P2 


h- 7-59 


2.9 


+ 


0.9 


6-12-59 


-32Pl^ 


3-19-59 


'?.h 


+ 


0.9 


i+- 22-59 


-33Ki+ 


3-19-59 


l.k 


+ 


0.9 


4-29-59 


-35L1 


3-18-59 


2.k 


+ 


0.8 


4-27-59 


19S/2W- 3A1 


3-18-59 


5.2 


+ 


0.9 


4-29-59 


- i+A5 


3-18-59 


2.3 


+ 


0.9 


4-29-59 


- 5C6 


3-18-59 


2.1 


+ 


0.9 


5- 5-59 


- 5G18 


3-19-59 


l.i+ 


+ 


0.8 


4-15-59 


- 5L2 


3-19-59 


5.1 


+ 


0.9 


4-22-59 



a MICROMICROCURIES PER LITER -PROBABLE ERROR COMPUTED AT ONE STANDARD 
DEVIATION IN MICROMICROCURIES PER LITER WITHOUT SELF ABSORBTION CORRECTION. 



B-70 



M 



>^/ 



THIS BOOK IS DUE ON THE LAST DATE 
STAMPED BELOW 



RENEWED BOOKS ARE SUBJECT TO IMMEDIATE 
RECALL 





LIBRARY, UNIVERSITY OF CALIFORNIA, DAVIS 

Book SIip-50m-8,'63(D9954s4)458 




306016 



California, Dept, of 
vJater Resources, 

PHYSICAL 
SWENCES 
LIBRARY 



Call Number 

TC82U 

C2 

A2 



TC &^^ 

AZ 

no. &6> rrei 



UNrvEBSiTYopcAiironN, 



3 1175 02037 6953 



LIBRARY 

UNIVERSITY OF CALIFORNIA 
DAVIS 

306016 



(aCe'S')